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Shared memory?

P

ph0b0s

n00b
Joined
Jan 19, 2010
Messages
33
What's up with having to reserve system memory to use with system devices. I have a 1Gb video card so about 1 Gb of my system memory is taken by the OS to shadow my video card's memory. With additional PCIe devices I think it is higher (raid controllers etc). I.E Win7 shows 6144 installed, but only 4500 available. I don't think Win 7 needs 1.5 Gb just to idle after boot.

And to explain I have a SSD so have superfetch disabled.

I have search around and cannot find any decent info for the following questions.

-I understand why low end video cards with hardly any on-board memory use shared / turbo memory. But why do cards with a decent amount of like mine need to have this?

-What is all this system memory used for?

-Why does it need to be statically reserved, why can't it be assigned dynamicaly like it is for programs.

-Does it need to match the memory on devices. I.e if I have 2 Xfires / SLI cards with 1GB each does that mean 1 or 2 GB of shared memory reserved.

The reason I ask all this is that new video cards hitting the market with 1.5 to 2 GB of on-board memory. Once you Xfire / SLI them that could be 4Gb (just for the video cards) of your system memory reserved for as far as I can tell no reason.

Can anyone provide some clarity on this?
 
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Are you using Windows 7 64bit?
Are you using a Core i7 or Core i5 CPU?
 
x64 and Core i7. Am not sure I have explained myself very well. The most simple explaination is that my available memory is about 1Gb different on boot, depending on whether I have 1 or both of my Nvidia cards installed.
 
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In your motherboard BIOs, look for a Memory Remap setting. That's more than likely what your issue is related to.

I've seen similar systems like yours make full available of 12GB of RAM with GTX 480 1280MB SLI just fine with Windows 7. The only issue was to enable Memory Remap.
 
Thanks for the replies, but it looks like I am talking out of my backside. It has been a while since I last looked at this and in the mean time it has solved itself. Don't know whether it was Bios updates or Windows 7 update, but I think that 1GB is being used by programs. I only have a couple of 100k MIA, so am not going to chase it any more. Forget I open my mouth without checking first.
 
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