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VRAM sharing?

post #1 of 14
Thread Starter 
A lot of games are using more than 1gb of vram these days so is there a way to share memory across two cards?

Is it possible to 'borrow' vram from another card?

With a sli setup, the frame buffer is duplicated so 2 cards would be able to process the info, but what if the second card just lent its memory to the first card and have it do nothing?

how about this?

You have your main card which does all the work and another "storage" card just for memory storage.

instead of storing the buffer in the main card is it possible to store it in the storage card and have the main card process using the storage card's memory?
Edited by tyuo9980 - 10/9/11 at 11:17am
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post #2 of 14
Ram is "duped" between the cards and not shared. Sadly.
post #3 of 14
It shares with system memory, up to 1024MB I believe.
post #4 of 14
Quote:
Originally Posted by Scorpion49 View Post
It shares with system memory, up to 1024MB I believe.
I don't think that is the case on a 64bit os.
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post #5 of 14
Quote:
Originally Posted by BababooeyHTJ View Post
I don't think that is the case on a 64bit os.
Correct, system RAM is so slow compared to GDDR5 if that truly was the case you'd be seeing those all too well known fps drops when VRAM is running looow.

Cheers,
GA
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post #6 of 14
Thread Starter 
how about this?

You have your main card which does all the work and another "storage" card just for memory storage.

instead of storing the buffer in the main card is it possible to store it in the storage card and have the main card process using the storage card's memory?
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post #7 of 14
Unfortunately no, it's not shared. Which to be honest i think it's about time it was.
 
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post #8 of 14
Quote:
Originally Posted by BababooeyHTJ View Post
I don't think that is the case on a 64bit os.
Quote:
Originally Posted by GrandArchitect View Post
Correct, system RAM is so slow compared to GDDR5 if that truly was the case you'd be seeing those all too well known fps drops when VRAM is running looow.

Cheers,
GA
It does share, up to 2.5GB on 64bit actually. Run DxDiag and you'll see it under the display tab. Every seen those reviews where they push too much AA and the card drops down to 5fps? Guess what. The performance hit as you mentioned is incredible, but it is something that windows will do. Just because it reserves that for GPU use doesn't mean you want to do so
post #9 of 14
It looks like you are right video memory does duplicate onto system ram in DX9. I guess that this does not happen with DX10 and probably 11 though.
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post #10 of 14
Lets hope that some day, Nvidia will make technology to share the VRAM from both cards.
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