I have a laptop (no integrated card) with a 7900GTX Go. I have heard things
about Turbo Cache and other NVIDIA features that might be the source of this.
I am POSITIVE Vista is doing this, I definitely do not have any NVIDIA
program that would or could do this, the card itself does not support shared
RAM normally, nor does the BIOS . I have searched everywhere I can think of,
and lots of people reported the same issue, but no one seemed to know how to
fix it, people commonly blamed it on drivers or some other thing. If anyone
knows how to fix it, please tell, there is no option in the BIOS, nothing I
have discovered in the control panel yet, but there is probably some command
or something I am missing. The BIOS does report that the card has ~756MB of
video RAM, when it is suppsoed to have 512, the system information also says
RAM is being shared.

I read somewhere that the GO 79xx boards all support an additional 256
MB of shared RAM.


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That maybe true, but I'm looking to disable the additional memory Vista
allocated to it, I already have 512MB of video ram, and I'd much rather have
the 512MB of RAM Vista stole for my system than my video card. I tried email
Microsoft, but since I didn't pay them the 60$ they wanted for 1 support
request, it wasn't much of a concern to them, they said "For assistance with
this issue, you may contact your computer manufacturer." Somehow this does
not suprise me, still I seriously doubt even a manufacturer like Dell would
be of much help with a Vista specific issue like this. Still, if any one has
any thoughts or anything that would be of any help, please post.

"KirkD" wrote:

>
> I read somewhere that the GO 79xx boards all support an additional 256
> MB of shared RAM.
>
>
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> KirkD
> ------------------------------------------------------------------------
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>
>

"Evan1157" wrote:

> I have a laptop (no integrated card) with a 7900GTX Go. I definitely do not have any NVIDIA
> program that would or could do this, the card itself does not support shared
> RAM normally, nor does the BIOS .

It's NOT used memory, but it's the AGP Aperture Size or PCI-E addressing.
When a videogame needs more memory, it will use the system RAM via AGP
Aperture Size or PCI-E addressing.
- "Dedicated system memory" 0 MB means no RAM is reserved (i.e. you don't
have a graphics card integrated into the mother board).
- "Shared system memory" is the phisical mem into graphics card + AGP
aperture size/PCI-E addressing. Shared doesn't mean used!

Ok, but this didn't occur when I had Xp, after I installed Vista, the system
properties screen reported the video card as having 1007Mb of video memory. I
did a test to make sure the ~512Mb was really being removed from the system:
I opened the task manager and ti reported ~890MB of RAM being used my the
system, I have a little monitor that tells how much RAM is free, and it
reported ~1.3GB of RAM being used. If there is a way to lower the PCI-E
addressing, if that is the problem, please let me know. My video card worked
just fine on Xp without whatever Vista did, and I would like my 512MB of RAM
back. Also note that I was running multiple programs at the same time, and
the monitor reported ~96% of the system RAM was being used, (I have 2GB) and
I checked the task manager again, and it reported ~1.6GB of RAM being used by
the collective tasks, so I'm pretty sure it's not going into the PCI-E
addressing memory or whatever when it's necessary.

"BillD" wrote:

>
>
> "Evan1157" wrote:
>
> > I have a laptop (no integrated card) with a 7900GTX Go. I definitely do not have any NVIDIA
> > program that would or could do this, the card itself does not support shared
> > RAM normally, nor does the BIOS .
>
> It's NOT used memory, but it's the AGP Aperture Size or PCI-E addressing.
> When a videogame needs more memory, it will use the system RAM via AGP
> Aperture Size or PCI-E addressing.
> - "Dedicated system memory" 0 MB means no RAM is reserved (i.e. you don't
> have a graphics card integrated into the mother board).
> - "Shared system memory" is the phisical mem into graphics card + AGP
> aperture size/PCI-E addressing. Shared doesn't mean used!