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M9700 SLI issue

post #1 of 4
1/16/11 at 2:48am
Thread Starter 
Okay, I searched the forum and couldn't find anything closely related to my problem. I have a M9700 with twin 256MB 7900GS video cards. SLI enabled. This is my second M9700 since my last one crap the bed when the North Bridge went bad. I am running Windows 7 x64 and I have the correct drivers and everything works fine. The only issue I have is with my Sli not working.

When I enable SLI and goto view the dedicated video memory it reads 256mb only....? odd, since in SLI mode it should read 512, unless I am wrong. However, I have a HDD with Windows Home 32bit installed on it, and with SLI enabled it too reads 256MB video memory. If SLI is enabled shouldnt it read 512MB? Does anyone notice that on theirs, if the memory goes up or down with SLI being enabled or Disabled?
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post #2 of 4
1/16/11 at 6:44am
From nVidia SLI ...

"The graphics memory is NOT doubled in SLI mode. If you have two 128MB graphics cards, you do NOT have an effective 256MB. Most of the games operate in AFR (alternate frame rendering). The first card renders one full frame and then the next card renders the next frame and so on. If you picture SLI working in this way it is easy to see that each frame only has 128MB of memory to work with."

cheers ...
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post #3 of 4
1/16/11 at 8:13pm
Thread Starter 
So if I am in SLI mode I essentially have 512MB of video memory since both cards have 256MB, but I wont see it double in the advanced menu. Gotcha
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post #4 of 4
1/16/11 at 8:28pm
You can say that - but actually you have double-performance with SLI more than having 512MB memory (in your case) in total.

It's called scaling -




cheers ...
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