No. At 3GB you are starting to enter the address range being reserved for
hardware and system by the BIOS.
With less than 4GB installed the system addresses are offset into the user
space by the memory manager and marked to prevent user programs from writing
there. When that is done only the system software is loaded into ram that
is currently needed. At 2GB you have some system software using up user
space and you can see that without running any applications a certain amount
of memory is already being used.
With 4GB installed the system addresses exist, maximum system software is
loaded into memory at the system addresses in upper ram and no offset is
done by the memory manager, but the space is hidden from user programs
because the mm is no longer protecting them. That is why you suddenly seem
to be missing some ram.
Your video card (and other hardware) has memory reserved by the BIOS for
buffering in the upper range of addresses once those addresses refer to
installed memory. This is different than what the memory on the video card
is used for.
"Shade00" <Shade00@xxxxxx> wrote in message
news:8714B021-1E57-486D-BF0E-994FA69CDDD6@xxxxxx
> My video card has dedicated memory. Plus, when there are 2GB installed it
> reports 2GB is installed. Wouldnt these other devices need memory when
> only
> 2GB is in the machine? Would upgrading to 3GB really cause my video card
> with
> dedicated memory (as denoted below) and other devices to suddenly need
> almost
> 500MB of RAM to operate?
>
> "Spirit" wrote:
>
>> The Video card and possibly other devices are sharing some of your system
>> memory.
>> Its all normal.
>>
>> "Shade00" <Shade00@xxxxxx> wrote in message
>> news:22DF3635-29B4-4F9B-8CD6-8A5760B4C266@xxxxxx
>> > 3GB RAM on Vista 32-bit Home Premium and system info is only reporting
>> > 2814MB. The motherboard bios is recognizing all 3GB and the memory has
>> > tested
>> > fine when only 1GB or 2GB is installed on it's own. The memory is all
>> > the
>> > same - Corsair - same product line and everything. Vista OS is up to
>> > date
>> > and
>> > I am using the latest bios for my motherboard. I will paste the system
>> > specs
>> > here.... (Any idea what could be going on here?)
>> >
>> > OS Name Microsoft® Windows VistaT Home Premium
>> > Version 6.0.6000 Build 6000
>> > Other OS Description Not Available
>> > OS Manufacturer Microsoft Corporation
>> > System Name (i removed this)
>> > System Manufacturer System manufacturer
>> > System Model System Product Name
>> > System Type X86-based PC
>> > Processor Intel(R) Core(TM)2 CPU 6600 @ 2.40GHz, 2400 Mhz, 2
>> > Core(s), 2 Logical Processor(s)
>> > BIOS Version/Date Phoenix Technologies, LTD ASUS P5NSLI ACPI BIOS
>> > Revision
>> > 1401, 5/29/2007
>> > SMBIOS Version 2.4
>> > Windows Directory C:\Windows
>> > System Directory C:\Windows\system32
>> > Boot Device \Device\HarddiskVolume1
>> > Locale United States
>> > Hardware Abstraction Layer Version = "6.0.6000.16386"
>> > User Name
>> > Time Zone Eastern Standard Time
>> > Total Physical Memory 2,813.75 MB
>> > Available Physical Memory 1.76 GB
>> > Total Virtual Memory 6.64 GB
>> > Available Virtual Memory 5.65 GB
>> > Page File Space 4.00 GB
>> > Page File C:\pagefile.sys
>> >
>> > Name NVIDIA GeForce 7950 GT
>> > PNP Device ID
>> > PCI\VEN_10DE&DEV_0295&SUBSYS_C6363842&REV_A1\4&36AAE60&0&0010
>> > Adapter Type GeForce 7950 GT, NVIDIA compatible
>> > Adapter Description NVIDIA GeForce 7950 GT
>> > Adapter RAM 256.00 MB (268,435,456 bytes)
>> > Installed Drivers nvd3dum.dll,nvwgf2um.dll
>> > Driver Version 7.15.11.6375
>> > INF File oem27.inf (nv_NV3x section)
>> > Color Planes Not Available
>> > Color Table Entries 4294967296
>> > Resolution 1680 x 1050 x 59 hertz
>> > Bits/Pixel 32
>> > Memory Address 0xC6000000-0xC8FFFFFF
>> > Memory Address 0xB0000000-0xBFFFFFFF
>> > Memory Address 0xC7000000-0xC7FFFFFF
>> > I/O Port 0x0000A000-0x0000AFFF
>> > IRQ Channel IRQ 16
>> > I/O Port 0x000003B0-0x000003BB
>> > I/O Port 0x000003C0-0x000003DF
>> > Memory Address 0xA0000-0xBFFFF
>> > Driver c:\windows\system32\drivers\nvlddmkm.sys (7.15.11.6375, 7.27 MB
>> > (7,625,088 bytes), 10/4/2007 6:14 PM)
>> >
>> > Any idea what is going on here?
>> >
>> > >>
>>
>>