Vista - Vista 32bit does not recognise 4GB memory

I am having a problem with Windows Vista 32bit. I have installed 4GB Kingston
667 memory on an ASUS P5B Deluxe motherboard. Vista only recognises 3GB of
the memory. I understand that certain devies require memory mapped access. I
have a 256MB video card that will take up sojme of the available address
space. I also understand that 32bit versions of Vista limit the total
available memory to 3.12GB.

I have attempted to enable the memory remapping feature in the BIOS setup.
When I return to Vista, it only recognizes 2GB of memory.

Is there any way around this problem other than installing the 64bit version
of Vista?

In addition, if installing the 64bit version of Vista, will all of my
applications run successfully? I do have a few custom business apps running
and I do not know whether they have drivers for 64bit operation.

Thanks I realize that all of this is quite complex, but I am curious as to
whether there are any answers out there.

"GreatGuruMemsahib" wrote:

> I am having a problem with Windows Vista 32bit. I have installed 4GB Kingston
> 667 memory on an ASUS P5B Deluxe motherboard. Vista only recognises 3GB of
> the memory. I understand that certain devies require memory mapped access. I
> have a 256MB video card that will take up sojme of the available address
> space. I also understand that 32bit versions of Vista limit the total
> available memory to 3.12GB.
>
> I have attempted to enable the memory remapping feature in the BIOS setup.
> When I return to Vista, it only recognizes 2GB of memory.
>
> Is there any way around this problem other than installing the 64bit version
> of Vista?
>
> In addition, if installing the 64bit version of Vista, will all of my
> applications run successfully? I do have a few custom business apps running
> and I do not know whether they have drivers for 64bit operation.
>
> Thanks I realize that all of this is quite complex, but I am curious as to
> whether there are any answers out there.

"GreatGuruMemsahib" wrote:

> I am having a problem with Windows Vista 32bit. I have installed 4GB Kingston
> 667 memory on an ASUS P5B Deluxe motherboard. Vista only recognises 3GB of
> the memory. I understand that certain devies require memory mapped access. I
> have a 256MB video card that will take up sojme of the available address
> space. I also understand that 32bit versions of Vista limit the total
> available memory to 3.12GB.
>
> I have attempted to enable the memory remapping feature in the BIOS setup.
> When I return to Vista, it only recognizes 2GB of memory.
>
> Is there any way around this problem other than installing the 64bit version
> of Vista?
>
> In addition, if installing the 64bit version of Vista, will all of my
> applications run successfully? I do have a few custom business apps running
> and I do not know whether they have drivers for 64bit operation.
>
> Thanks I realize that all of this is quite complex, but I am curious as to
> whether there are any answers out there.

It is not a problem. You can look in your BIOS and see if you have 4GB. The
operating system has to have some space allocated for it to do its work; it
needs buffers for I/O and needs to have memory to allocate for the data
structures it needs to keep track of things. The 3.12GB is the amount of
space that can be allocated for your Working Set. Actually, your working set
in memory at any one time may be less. There may also be other programs in
memory at the same time; such as your mail agent that periodically checks for
mail. Ideally, the operating system tries to keep in memory what it may need
next. If it doesn't have it in memory then it has to fetched from virtual
memory. That may mean that other parts of your working set that are not
likely to be needed are overlaid by the code bing fetched.

I don't think you need to go to 64-bit just because 64-bit can address 2^64
locations. If you have only 4GB of memory and a 64-bit operating system there
will still be the same allocation for the operating system. If you add memory
over 4GB then you will need a 64-bit operating system to access the memory
above 2^32 locations.

Hello,
Sorry but no. The hardware in the system is reserving the address space.
Since 32-bit processors are limited to 4 gig of address space, hardware
that requries addressing( like video cards or other devices including PCI)
has to reserve some of the address space, thus limiting the amount of RAM
that is available to Windows. Windows is not reserving that memory, the
hardware in the system is reserving that space. Since there is a
limitation of 4 gig of address space and there is overlap, the amount of
RAM that can be addressed is reduced by the amount of address space the
hardware requests.
Thanks,
Darrell Gorter[MSFT]

This posting is provided "AS IS" with no warranties, and confers no rights
--------------------
|>Thread-Topic: Vista 32bit does not recognise 4GB memory
|>thread-index: Acdd5zio4a06f0dITDOOQxEcwejddQ==
|>X-WBNR-Posting-Host: 67.35.76.243
|>From: =?Utf-8?B?cm9nZWxhaA==?= <rogelah@discussions.microsoft.com>
|>References: <2C05B223-D3FB-4A82-972C-B988745EC2E7@microsoft.com>
|>Subject: RE: Vista 32bit does not recognise 4GB memory
|>Date: Sat, 3 Mar 2007 14:56:47 -0800
|>Lines: 41
|>Message-ID: <1C1E5477-C0C7-45F6-AD77-25314789E8A0@microsoft.com>
|>MIME-Version: 1.0
|>Content-Type: text/plain;
|> charset="Utf-8"
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microsoft.public.windows.vista.installation_setup:11232
|>NNTP-Posting-Host: TK2MSFTSBFM01 10.40.244.148
|>X-Tomcat-NG: microsoft.public.windows.vista.installation_setup
|>
|>
|>
|>"GreatGuruMemsahib" wrote:
|>
|>> I am having a problem with Windows Vista 32bit. I have installed 4GB
Kingston
|>> 667 memory on an ASUS P5B Deluxe motherboard. Vista only recognises 3GB
of
|>> the memory. I understand that certain devies require memory mapped
access. I
|>> have a 256MB video card that will take up sojme of the available
address
|>> space. I also understand that 32bit versions of Vista limit the total
|>> available memory to 3.12GB.
|>>
|>> I have attempted to enable the memory remapping feature in the BIOS
setup.
|>> When I return to Vista, it only recognizes 2GB of memory.
|>>
|>> Is there any way around this problem other than installing the 64bit
version
|>> of Vista?
|>>
|>> In addition, if installing the 64bit version of Vista, will all of my
|>> applications run successfully? I do have a few custom business apps
running
|>> and I do not know whether they have drivers for 64bit operation.
|>>
|>> Thanks I realize that all of this is quite complex, but I am curious as
to
|>> whether there are any answers out there.
|>
|>It is not a problem. You can look in your BIOS and see if you have 4GB.
The
|>operating system has to have some space allocated for it to do its work;
it
|>needs buffers for I/O and needs to have memory to allocate for the data
|>structures it needs to keep track of things. The 3.12GB is the amount of
|>space that can be allocated for your Working Set. Actually, your working
set
|>in memory at any one time may be less. There may also be other programs
in
|>memory at the same time; such as your mail agent that periodically checks
for
|>mail. Ideally, the operating system tries to keep in memory what it may
need
|>next. If it doesn't have it in memory then it has to fetched from virtual
|>memory. That may mean that other parts of your working set that are not
|>likely to be needed are overlaid by the code bing fetched.
|>
|>I don't think you need to go to 64-bit just because 64-bit can address
2^64
|>locations. If you have only 4GB of memory and a 64-bit operating system
there
|>will still be the same allocation for the operating system. If you add
memory
|>over 4GB then you will need a 64-bit operating system to access the
memory
|>above 2^32 locations.
|>

Agreed, however shouldn't enabling memory re-mapping (which if I recall maps
the address space above the 16GB line which properly allows hardware devices
to map within the first 4GB of address space) solve the issue? Or does
Vista not handle this? I know server does, but does Vista?

Joe

""Darrell Gorter[MSFT]"" <Darrellg@online.microsoft.com> wrote in message
newsRer1#rXHHA.2308@TK2MSFTNGHUB02.phx.gbl...
> Hello,
> Sorry but no. The hardware in the system is reserving the address space.
> Since 32-bit processors are limited to 4 gig of address space, hardware
> that requries addressing( like video cards or other devices including PCI)
> has to reserve some of the address space, thus limiting the amount of RAM
> that is available to Windows. Windows is not reserving that memory, the
> hardware in the system is reserving that space. Since there is a
> limitation of 4 gig of address space and there is overlap, the amount of
> RAM that can be addressed is reduced by the amount of address space the
> hardware requests.
> Thanks,
> Darrell Gorter[MSFT]
>
> This posting is provided "AS IS" with no warranties, and confers no rights
> --------------------
> |>Thread-Topic: Vista 32bit does not recognise 4GB memory
> |>thread-index: Acdd5zio4a06f0dITDOOQxEcwejddQ==
> |>X-WBNR-Posting-Host: 67.35.76.243
> |>From: =?Utf-8?B?cm9nZWxhaA==?= <rogelah@discussions.microsoft.com>
> |>References: <2C05B223-D3FB-4A82-972C-B988745EC2E7@microsoft.com>
> |>Subject: RE: Vista 32bit does not recognise 4GB memory
> |>Date: Sat, 3 Mar 2007 14:56:47 -0800
> |>Lines: 41
> |>Message-ID: <1C1E5477-C0C7-45F6-AD77-25314789E8A0@microsoft.com>
> |>MIME-Version: 1.0
> |>Content-Type: text/plain;
> |> charset="Utf-8"
> |>Content-Transfer-Encoding: 7bit
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> |>Content-Class: urn:content-classes:message
> |>Importance: normal
> |>Priority: normal
> |>X-MimeOLE: Produced By Microsoft MimeOLE V6.00.3790.2757
> |>Newsgroups: microsoft.public.windows.vista.installation_setup
> |>Path: TK2MSFTNGHUB02.phx.gbl
> |>Xref: TK2MSFTNGHUB02.phx.gbl
> microsoft.public.windows.vista.installation_setup:11232
> |>NNTP-Posting-Host: TK2MSFTSBFM01 10.40.244.148
> |>X-Tomcat-NG: microsoft.public.windows.vista.installation_setup
> |>
> |>
> |>
> |>"GreatGuruMemsahib" wrote:
> |>
> |>> I am having a problem with Windows Vista 32bit. I have installed 4GB
> Kingston
> |>> 667 memory on an ASUS P5B Deluxe motherboard. Vista only recognises
> 3GB
> of
> |>> the memory. I understand that certain devies require memory mapped
> access. I
> |>> have a 256MB video card that will take up sojme of the available
> address
> |>> space. I also understand that 32bit versions of Vista limit the total
> |>> available memory to 3.12GB.
> |>>
> |>> I have attempted to enable the memory remapping feature in the BIOS
> setup.
> |>> When I return to Vista, it only recognizes 2GB of memory.
> |>>
> |>> Is there any way around this problem other than installing the 64bit
> version
> |>> of Vista?
> |>>
> |>> In addition, if installing the 64bit version of Vista, will all of my
> |>> applications run successfully? I do have a few custom business apps
> running
> |>> and I do not know whether they have drivers for 64bit operation.
> |>>
> |>> Thanks I realize that all of this is quite complex, but I am curious
> as
> to
> |>> whether there are any answers out there.
> |>
> |>It is not a problem. You can look in your BIOS and see if you have 4GB.
> The
> |>operating system has to have some space allocated for it to do its work;
> it
> |>needs buffers for I/O and needs to have memory to allocate for the data
> |>structures it needs to keep track of things. The 3.12GB is the amount of
> |>space that can be allocated for your Working Set. Actually, your working
> set
> |>in memory at any one time may be less. There may also be other programs
> in
> |>memory at the same time; such as your mail agent that periodically
> checks
> for
> |>mail. Ideally, the operating system tries to keep in memory what it may
> need
> |>next. If it doesn't have it in memory then it has to fetched from
> virtual
> |>memory. That may mean that other parts of your working set that are not
> |>likely to be needed are overlaid by the code bing fetched.
> |>
> |>I don't think you need to go to 64-bit just because 64-bit can address
> 2^64
> |>locations. If you have only 4GB of memory and a 64-bit operating system
> there
> |>will still be the same allocation for the operating system. If you add
> memory
> |>over 4GB then you will need a 64-bit operating system to access the
> memory
> |>above 2^32 locations.
> |>
>

Hello Joe,
The firmware has to support the re-mapping. (workstation and server
machines usually do)
The processor has to support the remapping( most current processors should).
You need to be running with PAE enabled
Now the hardware can be remapped above the 4 gig addess space. However not
all drivers work well after being remapped so other issues can occur.

Thanks,
Darrell Gorter[MSFT]

This posting is provided "AS IS" with no warranties, and confers no rights
--------------------
|>From: "Joe Guidera" <jguidera-remove@msn.com>
|>References: <2C05B223-D3FB-4A82-972C-B988745EC2E7@microsoft.com>
<1C1E5477-C0C7-45F6-AD77-25314789E8A0@microsoft.com>
<oRer1#rXHHA.2308@TK2MSFTNGHUB02.phx.gbl>
|>Subject: Re: Vista 32bit does not recognise 4GB memory
|>Date: Sun, 4 Mar 2007 20:23:58 -0600
|>Keywords: < Not Specified >
|>Lines: 114
|>Message-ID: <C224663C-8DFD-4410-AC72-EA4A9B5787C2@microsoft.com>
|>MIME-Version: 1.0
|>Content-Type: text/plain;
|> format=flowed;
|> charset="iso-8859-1";
|> reply-type=original
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|>X-MS-CommunityGroup-PostID: {C224663C-8DFD-4410-AC72-EA4A9B5787C2}
|>X-MS-CommunityGroup-ThreadID: 2C05B223-D3FB-4A82-972C-B988745EC2E7
|>X-MS-CommunityGroup-ParentID: FD7006D9-D2B7-407C-A8CC-79B439BD9E42
|>Newsgroups: microsoft.public.windows.vista.installation_setup
|>Path: TK2MSFTNGHUB02.phx.gbl
|>Xref: TK2MSFTNGHUB02.phx.gbl
microsoft.public.windows.vista.installation_setup:11417
|>NNTP-Posting-Host: TK2MSFTNGHUB02.phx.gbl 127.0.0.1
|>X-Tomcat-NG: microsoft.public.windows.vista.installation_setup
|>
|>Agreed, however shouldn't enabling memory re-mapping (which if I recall
maps
|>the address space above the 16GB line which properly allows hardware
devices
|>to map within the first 4GB of address space) solve the issue? Or does
|>Vista not handle this? I know server does, but does Vista?
|>
|>Joe
|>
|>""Darrell Gorter[MSFT]"" <Darrellg@online.microsoft.com> wrote in message
|>newsRer1#rXHHA.2308@TK2MSFTNGHUB02.phx.gbl...
|>> Hello,
|>> Sorry but no. The hardware in the system is reserving the address
space.
|>> Since 32-bit processors are limited to 4 gig of address space, hardware
|>> that requries addressing( like video cards or other devices including
PCI)
|>> has to reserve some of the address space, thus limiting the amount of
RAM
|>> that is available to Windows. Windows is not reserving that memory, the
|>> hardware in the system is reserving that space. Since there is a
|>> limitation of 4 gig of address space and there is overlap, the amount of
|>> RAM that can be addressed is reduced by the amount of address space the
|>> hardware requests.
|>> Thanks,
|>> Darrell Gorter[MSFT]
|>>
|>> This posting is provided "AS IS" with no warranties, and confers no
rights
|>> --------------------
|>> |>Thread-Topic: Vista 32bit does not recognise 4GB memory
|>> |>thread-index: Acdd5zio4a06f0dITDOOQxEcwejddQ==
|>> |>X-WBNR-Posting-Host: 67.35.76.243
|>> |>From: =?Utf-8?B?cm9nZWxhaA==?= <rogelah@discussions.microsoft.com>
|>> |>References: <2C05B223-D3FB-4A82-972C-B988745EC2E7@microsoft.com>
|>> |>Subject: RE: Vista 32bit does not recognise 4GB memory
|>> |>Date: Sat, 3 Mar 2007 14:56:47 -0800
|>> |>Lines: 41
|>> |>Message-ID: <1C1E5477-C0C7-45F6-AD77-25314789E8A0@microsoft.com>
|>> |>MIME-Version: 1.0
|>> |>Content-Type: text/plain;
|>> |> charset="Utf-8"
|>> |>Content-Transfer-Encoding: 7bit
|>> |>X-Newsreader: Microsoft CDO for Windows 2000
|>> |>Content-Class: urn:content-classes:message
|>> |>Importance: normal
|>> |>Priority: normal
|>> |>X-MimeOLE: Produced By Microsoft MimeOLE V6.00.3790.2757
|>> |>Newsgroups: microsoft.public.windows.vista.installation_setup
|>> |>Path: TK2MSFTNGHUB02.phx.gbl
|>> |>Xref: TK2MSFTNGHUB02.phx.gbl
|>> microsoft.public.windows.vista.installation_setup:11232
|>> |>NNTP-Posting-Host: TK2MSFTSBFM01 10.40.244.148
|>> |>X-Tomcat-NG: microsoft.public.windows.vista.installation_setup
|>> |>
|>> |>
|>> |>
|>> |>"GreatGuruMemsahib" wrote:
|>> |>
|>> |>> I am having a problem with Windows Vista 32bit. I have installed 4GB
|>> Kingston
|>> |>> 667 memory on an ASUS P5B Deluxe motherboard. Vista only recognises
|>> 3GB
|>> of
|>> |>> the memory. I understand that certain devies require memory mapped
|>> access. I
|>> |>> have a 256MB video card that will take up sojme of the available
|>> address
|>> |>> space. I also understand that 32bit versions of Vista limit the
total
|>> |>> available memory to 3.12GB.
|>> |>>
|>> |>> I have attempted to enable the memory remapping feature in the BIOS
|>> setup.
|>> |>> When I return to Vista, it only recognizes 2GB of memory.
|>> |>>
|>> |>> Is there any way around this problem other than installing the 64bit
|>> version
|>> |>> of Vista?
|>> |>>
|>> |>> In addition, if installing the 64bit version of Vista, will all of
my
|>> |>> applications run successfully? I do have a few custom business apps
|>> running
|>> |>> and I do not know whether they have drivers for 64bit operation.
|>> |>>
|>> |>> Thanks I realize that all of this is quite complex, but I am
curious
|>> as
|>> to
|>> |>> whether there are any answers out there.
|>> |>
|>> |>It is not a problem. You can look in your BIOS and see if you have
4GB.
|>> The
|>> |>operating system has to have some space allocated for it to do its
work;
|>> it
|>> |>needs buffers for I/O and needs to have memory to allocate for the
data
|>> |>structures it needs to keep track of things. The 3.12GB is the amount
of
|>> |>space that can be allocated for your Working Set. Actually, your
working
|>> set
|>> |>in memory at any one time may be less. There may also be other
programs
|>> in
|>> |>memory at the same time; such as your mail agent that periodically
|>> checks
|>> for
|>> |>mail. Ideally, the operating system tries to keep in memory what it
may
|>> need
|>> |>next. If it doesn't have it in memory then it has to fetched from
|>> virtual
|>> |>memory. That may mean that other parts of your working set that are
not
|>> |>likely to be needed are overlaid by the code bing fetched.
|>> |>
|>> |>I don't think you need to go to 64-bit just because 64-bit can address
|>> 2^64
|>> |>locations. If you have only 4GB of memory and a 64-bit operating
system
|>> there
|>> |>will still be the same allocation for the operating system. If you add
|>> memory
|>> |>over 4GB then you will need a 64-bit operating system to access the
|>> memory
|>> |>above 2^32 locations.
|>> |>
|>>
|>

That's what I meant. Does Vista support PAE? I believe for example that XP
did not (only available in Windows Server) so the maximum amount of usable
memory was 3GB.

Joe

""Darrell Gorter[MSFT]"" <Darrellg@online.microsoft.com> wrote in message
news:USXv9XtXHHA.4016@TK2MSFTNGHUB02.phx.gbl...
> Hello Joe,
> The firmware has to support the re-mapping. (workstation and server
> machines usually do)
> The processor has to support the remapping( most current processors
> should).
> You need to be running with PAE enabled
> Now the hardware can be remapped above the 4 gig addess space. However
> not
> all drivers work well after being remapped so other issues can occur.
>
> Thanks,
> Darrell Gorter[MSFT]
>
> This posting is provided "AS IS" with no warranties, and confers no rights
> --------------------
> |>From: "Joe Guidera" <jguidera-remove@msn.com>
> |>References: <2C05B223-D3FB-4A82-972C-B988745EC2E7@microsoft.com>
> <1C1E5477-C0C7-45F6-AD77-25314789E8A0@microsoft.com>
> <oRer1#rXHHA.2308@TK2MSFTNGHUB02.phx.gbl>
> |>Subject: Re: Vista 32bit does not recognise 4GB memory
> |>Date: Sun, 4 Mar 2007 20:23:58 -0600
> |>Keywords: < Not Specified >
> |>Lines: 114
> |>Message-ID: <C224663C-8DFD-4410-AC72-EA4A9B5787C2@microsoft.com>
> |>MIME-Version: 1.0
> |>Content-Type: text/plain;
> |> format=flowed;
> |> charset="iso-8859-1";
> |> reply-type=original
> |>Content-Transfer-Encoding: 7bit
> |>X-Priority: 3
> |>X-MSMail-Priority: Normal
> |>X-Newsreader: Microsoft Windows Live Mail desktop 8.0.1226
> |>X-MimeOLE: Produced By Microsoft MimeOLE V8.0.1226
> |>X-MS-CommunityGroup-PostID: {C224663C-8DFD-4410-AC72-EA4A9B5787C2}
> |>X-MS-CommunityGroup-ThreadID: 2C05B223-D3FB-4A82-972C-B988745EC2E7
> |>X-MS-CommunityGroup-ParentID: FD7006D9-D2B7-407C-A8CC-79B439BD9E42
> |>Newsgroups: microsoft.public.windows.vista.installation_setup
> |>Path: TK2MSFTNGHUB02.phx.gbl
> |>Xref: TK2MSFTNGHUB02.phx.gbl
> microsoft.public.windows.vista.installation_setup:11417
> |>NNTP-Posting-Host: TK2MSFTNGHUB02.phx.gbl 127.0.0.1
> |>X-Tomcat-NG: microsoft.public.windows.vista.installation_setup
> |>
> |>Agreed, however shouldn't enabling memory re-mapping (which if I recall
> maps
> |>the address space above the 16GB line which properly allows hardware
> devices
> |>to map within the first 4GB of address space) solve the issue? Or does
> |>Vista not handle this? I know server does, but does Vista?
> |>
> |>Joe
> |>
> |>""Darrell Gorter[MSFT]"" <Darrellg@online.microsoft.com> wrote in
> message
> |>newsRer1#rXHHA.2308@TK2MSFTNGHUB02.phx.gbl...
> |>> Hello,
> |>> Sorry but no. The hardware in the system is reserving the address
> space.
> |>> Since 32-bit processors are limited to 4 gig of address space,
> hardware
> |>> that requries addressing( like video cards or other devices including
> PCI)
> |>> has to reserve some of the address space, thus limiting the amount of
> RAM
> |>> that is available to Windows. Windows is not reserving that memory,
> the
> |>> hardware in the system is reserving that space. Since there is a
> |>> limitation of 4 gig of address space and there is overlap, the amount
> of
> |>> RAM that can be addressed is reduced by the amount of address space
> the
> |>> hardware requests.
> |>> Thanks,
> |>> Darrell Gorter[MSFT]
> |>>
> |>> This posting is provided "AS IS" with no warranties, and confers no
> rights
> |>> --------------------
> |>> |>Thread-Topic: Vista 32bit does not recognise 4GB memory
> |>> |>thread-index: Acdd5zio4a06f0dITDOOQxEcwejddQ==
> |>> |>X-WBNR-Posting-Host: 67.35.76.243
> |>> |>From: =?Utf-8?B?cm9nZWxhaA==?= <rogelah@discussions.microsoft.com>
> |>> |>References: <2C05B223-D3FB-4A82-972C-B988745EC2E7@microsoft.com>
> |>> |>Subject: RE: Vista 32bit does not recognise 4GB memory
> |>> |>Date: Sat, 3 Mar 2007 14:56:47 -0800
> |>> |>Lines: 41
> |>> |>Message-ID: <1C1E5477-C0C7-45F6-AD77-25314789E8A0@microsoft.com>
> |>> |>MIME-Version: 1.0
> |>> |>Content-Type: text/plain;
> |>> |> charset="Utf-8"
> |>> |>Content-Transfer-Encoding: 7bit
> |>> |>X-Newsreader: Microsoft CDO for Windows 2000
> |>> |>Content-Class: urn:content-classes:message
> |>> |>Importance: normal
> |>> |>Priority: normal
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> |>> |>Newsgroups: microsoft.public.windows.vista.installation_setup
> |>> |>Path: TK2MSFTNGHUB02.phx.gbl
> |>> |>Xref: TK2MSFTNGHUB02.phx.gbl
> |>> microsoft.public.windows.vista.installation_setup:11232
> |>> |>NNTP-Posting-Host: TK2MSFTSBFM01 10.40.244.148
> |>> |>X-Tomcat-NG: microsoft.public.windows.vista.installation_setup
> |>> |>
> |>> |>
> |>> |>
> |>> |>"GreatGuruMemsahib" wrote:
> |>> |>
> |>> |>> I am having a problem with Windows Vista 32bit. I have installed
> 4GB
> |>> Kingston
> |>> |>> 667 memory on an ASUS P5B Deluxe motherboard. Vista only
> recognises
> |>> 3GB
> |>> of
> |>> |>> the memory. I understand that certain devies require memory mapped
> |>> access. I
> |>> |>> have a 256MB video card that will take up sojme of the available
> |>> address
> |>> |>> space. I also understand that 32bit versions of Vista limit the
> total
> |>> |>> available memory to 3.12GB.
> |>> |>>
> |>> |>> I have attempted to enable the memory remapping feature in the
> BIOS
> |>> setup.
> |>> |>> When I return to Vista, it only recognizes 2GB of memory.
> |>> |>>
> |>> |>> Is there any way around this problem other than installing the
> 64bit
> |>> version
> |>> |>> of Vista?
> |>> |>>
> |>> |>> In addition, if installing the 64bit version of Vista, will all of
> my
> |>> |>> applications run successfully? I do have a few custom business
> apps
> |>> running
> |>> |>> and I do not know whether they have drivers for 64bit operation.
> |>> |>>
> |>> |>> Thanks I realize that all of this is quite complex, but I am
> curious
> |>> as
> |>> to
> |>> |>> whether there are any answers out there.
> |>> |>
> |>> |>It is not a problem. You can look in your BIOS and see if you have
> 4GB.
> |>> The
> |>> |>operating system has to have some space allocated for it to do its
> work;
> |>> it
> |>> |>needs buffers for I/O and needs to have memory to allocate for the
> data
> |>> |>structures it needs to keep track of things. The 3.12GB is the
> amount
> of
> |>> |>space that can be allocated for your Working Set. Actually, your
> working
> |>> set
> |>> |>in memory at any one time may be less. There may also be other
> programs
> |>> in
> |>> |>memory at the same time; such as your mail agent that periodically
> |>> checks
> |>> for
> |>> |>mail. Ideally, the operating system tries to keep in memory what it
> may
> |>> need
> |>> |>next. If it doesn't have it in memory then it has to fetched from
> |>> virtual
> |>> |>memory. That may mean that other parts of your working set that are
> not
> |>> |>likely to be needed are overlaid by the code bing fetched.
> |>> |>
> |>> |>I don't think you need to go to 64-bit just because 64-bit can
> address
> |>> 2^64
> |>> |>locations. If you have only 4GB of memory and a 64-bit operating
> system
> |>> there
> |>> |>will still be the same allocation for the operating system. If you
> add
> |>> memory
> |>> |>over 4GB then you will need a 64-bit operating system to access the
> |>> memory
> |>> |>above 2^32 locations.
> |>> |>
> |>>
> |>
>

Pl. check this KB article:
http://support.microsoft.com/kb/929605/en-us
"If a computer has 4 gigabytes (GB) of random-access memory (RAM) installed,
the system memory that is reported in the System Information dialog box in
Windows Vista is less than you expect"

For Windows Vista to use all 4 GB of memory on a computer that has 4 GB of
memory installed, the computer must meet the following requirements:
• The chipset must support at least 8 GB of address space. Chipsets that
have this capability include the following:
• Intel 975X
• Intel P965
• Intel 955X on Socket 775
• Chipsets that support AMD processors that use socket F, socket 940, socket
939, or socket AM2. These chipsets include any AMD socket and CPU combination
in which the memory controller resides in the CPU.
• The CPU must support the x64 instruction set. The AMD64 CPU and the Intel
EM64T CPU support this instruction set.
• The BIOS must support the memory remapping feature. The memory remapping
feature allows for the segment of system memory that was previously
overwritten by the Peripheral Component Interconnect (PCI) configuration
space to be remapped above the 4 GB address line. This feature must be
enabled in the BIOS configuration utility on the computer. View your computer
product documentation for instructions that explain how to enable this
feature. Many consumer-oriented computers may not support the memory
remapping feature. No standard terminology is used in documentation or in
BIOS configuration utilities for this feature. Therefore, you may have to
read the descriptions of the various BIOS configuration settings that are
available to determine whether any of the settings enable the memory
remapping feature.
• An x64 (64-bit) version of Windows Vista must be used.

Then it also talks of
PAE-mode-induced driver compatibility issues.

Pl. check the KB article for complete reading.
http://support.microsoft.com/kb/929605/en-us

vasudev

Hmm, that article would seem to suggest that PAE is, in fact, supported on
Vista (and it must be automatic as I don't see a reference to modifying the
boot to enable it). Interesting. But to some extent the article is also
self contradictory. I.E. it says you need one of the name chipsets but then
goes on to say that you need a chipset that supports the X64 instruction set
(which if you had you shouldn't need PAE if you're using Vista X64 as it
should be using a flat address space capable of much larger than 4GB of
address space).

Digging back in memory PAE/MMIO and re-mapping above the 16GB line only
applied to X32 (as the 32-bit word had a maximum value of 4GB).

Thanks for the article reference. Still isn't real clear (and to be honest
my question was more academic than otherwise). If MS is reading this they
should perhaps clarify the article.

I believe what they were getting at was you needed EITHER a chipset and BIOS
that supports remapping above the 4GB line (e.g. PAE) OR a chipset with X64
instruction support (meaning you have an address space larger than 4GB to
work with to begin with). If either of the above is true Vista should
correctly report the installed memory of 4GB. It also goes on to warn that
while the hardware might properly support it, and the OS might properly
support it, your drivers might not <g> More likely in a 32-bit than in 64.

Cheers,
J

"vasu" <vasu@discussions.microsoft.com> wrote in message
news:27ACE085-9C9A-471A-89E1-F3C9E342F1B4@microsoft.com...
> Pl. check this KB article:
> http://support.microsoft.com/kb/929605/en-us
> "If a computer has 4 gigabytes (GB) of random-access memory (RAM)
> installed,
> the system memory that is reported in the System Information dialog box in
> Windows Vista is less than you expect"
>
> For Windows Vista to use all 4 GB of memory on a computer that has 4 GB of
> memory installed, the computer must meet the following requirements:
> • The chipset must support at least 8 GB of address space. Chipsets that
> have this capability include the following:
> • Intel 975X
> • Intel P965
> • Intel 955X on Socket 775
> • Chipsets that support AMD processors that use socket F, socket 940,
> socket
> 939, or socket AM2. These chipsets include any AMD socket and CPU
> combination
> in which the memory controller resides in the CPU.
> • The CPU must support the x64 instruction set. The AMD64 CPU and the
> Intel
> EM64T CPU support this instruction set.
> • The BIOS must support the memory remapping feature. The memory remapping
> feature allows for the segment of system memory that was previously
> overwritten by the Peripheral Component Interconnect (PCI) configuration
> space to be remapped above the 4 GB address line. This feature must be
> enabled in the BIOS configuration utility on the computer. View your
> computer
> product documentation for instructions that explain how to enable this
> feature. Many consumer-oriented computers may not support the memory
> remapping feature. No standard terminology is used in documentation or in
> BIOS configuration utilities for this feature. Therefore, you may have to
> read the descriptions of the various BIOS configuration settings that are
> available to determine whether any of the settings enable the memory
> remapping feature.
> • An x64 (64-bit) version of Windows Vista must be used.
>
> Then it also talks of
> PAE-mode-induced driver compatibility issues.
>
> Pl. check the KB article for complete reading.
> http://support.microsoft.com/kb/929605/en-us
>
> vasudev
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>

Yes Joe, in fact such behavior was also seen in XP also when 4GB RAM was
used.
Also check this article http://support.microsoft.com/?kbid=929777, which
also provides an update for systems showing error when Vista installed on
system more than 3GB.

regards
vasudev


"Joe Guidera" <jguidera-remove@msn.com> wrote in message
news:0F889E31-1979-4D2F-8E80-82773977B233@microsoft.com...
> Hmm, that article would seem to suggest that PAE is, in fact, supported on
> Vista (and it must be automatic as I don't see a reference to modifying
> the boot to enable it). Interesting. But to some extent the article is
> also self contradictory. I.E. it says you need one of the name chipsets
> but then goes on to say that you need a chipset that supports the X64
> instruction set (which if you had you shouldn't need PAE if you're using
> Vista X64 as it should be using a flat address space capable of much
> larger than 4GB of address space).
>
> Digging back in memory PAE/MMIO and re-mapping above the 16GB line only
> applied to X32 (as the 32-bit word had a maximum value of 4GB).
>
> Thanks for the article reference. Still isn't real clear (and to be
> honest my question was more academic than otherwise). If MS is reading
> this they should perhaps clarify the article.
>
> I believe what they were getting at was you needed EITHER a chipset and
> BIOS that supports remapping above the 4GB line (e.g. PAE) OR a chipset
> with X64 instruction support (meaning you have an address space larger
> than 4GB to work with to begin with). If either of the above is true
> Vista should correctly report the installed memory of 4GB. It also goes
> on to warn that while the hardware might properly support it, and the OS
> might properly support it, your drivers might not <g> More likely in a
> 32-bit than in 64.
>
> Cheers,
> J
>
> "vasu" <vasu@discussions.microsoft.com> wrote in message
> news:27ACE085-9C9A-471A-89E1-F3C9E342F1B4@microsoft.com...
>> Pl. check this KB article:
>> http://support.microsoft.com/kb/929605/en-us
>> "If a computer has 4 gigabytes (GB) of random-access memory (RAM)
>> installed,
>> the system memory that is reported in the System Information dialog box
>> in
>> Windows Vista is less than you expect"
>>
>> For Windows Vista to use all 4 GB of memory on a computer that has 4 GB
>> of
>> memory installed, the computer must meet the following requirements:
>> • The chipset must support at least 8 GB of address space. Chipsets that
>> have this capability include the following:
>> • Intel 975X
>> • Intel P965
>> • Intel 955X on Socket 775
>> • Chipsets that support AMD processors that use socket F, socket 940,
>> socket
>> 939, or socket AM2. These chipsets include any AMD socket and CPU
>> combination
>> in which the memory controller resides in the CPU.
>> • The CPU must support the x64 instruction set. The AMD64 CPU and the
>> Intel
>> EM64T CPU support this instruction set.
>> • The BIOS must support the memory remapping feature. The memory
>> remapping
>> feature allows for the segment of system memory that was previously
>> overwritten by the Peripheral Component Interconnect (PCI) configuration
>> space to be remapped above the 4 GB address line. This feature must be
>> enabled in the BIOS configuration utility on the computer. View your
>> computer
>> product documentation for instructions that explain how to enable this
>> feature. Many consumer-oriented computers may not support the memory
>> remapping feature. No standard terminology is used in documentation or in
>> BIOS configuration utilities for this feature. Therefore, you may have to
>> read the descriptions of the various BIOS configuration settings that are
>> available to determine whether any of the settings enable the memory
>> remapping feature.
>> • An x64 (64-bit) version of Windows Vista must be used.
>>
>> Then it also talks of
>> PAE-mode-induced driver compatibility issues.
>>
>> Pl. check the KB article for complete reading.
>> http://support.microsoft.com/kb/929605/en-us
>>
>> vasudev
>>
>>
>>
>>
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>>
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