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sli memory question.

Last response: in Graphics & Displays
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March 23, 2007 3:30:10 PM

It was my understanding that when you run cards in sli that it runs the same info to process on both cards. Thus, not doubling your vram. But then I came across this article.
http://www.tweaktown.com/articles/1068/nvidia_geforce_8800gts_640mb_vs_1280mb_in_sli_mode/index.html
So which is it? Total memory or just single card memory?

More about : sli memory question

March 23, 2007 3:34:33 PM

Um yeah unless I'm terribly mistaken I was sure both cards had all the same data in memory, so two 640s in SLi would only have 640 to work with. But I also thought Tweaktown was reputable... this is disturbing.

edit: After looking at their tests, I think the author is just a moron. You can see in the CoH test, the 320mb SLi gets killed by the 640. Absolutely destroyed. This must be due to its memory being overflowed, and I doubt total 640mb could be overflowed currently.
March 23, 2007 3:49:36 PM

Do you suppose that with the 8800 architecture/drivers they have been able to overcome the memory mirroring issue. I also thought tweaktown was quite reputable, so it makes me wonder.
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March 24, 2007 2:15:10 PM

On the nvidia homepage, madmodmike, who I believe is the guru over there, said in a post about 2 6000 series cards that sli only uses one cards worth of vram. But it is interesting that nvidia markets quad sli with 2 7950gx2 as having 2g of total vram. This seems to contradict what is being otherwise stated. However, I believe this is nothing more than marketing and sli'ed cards still mirror the info to both cards. If someone has some recent/differing news on this it would be awesome to here it as I have a 8800gts 320 and would seriously think about running sli (I have the mobo for it) if I can get total vram. I think trying to run a pair of 8800's with only 320mb would probably be quite limiting.
March 24, 2007 3:02:39 PM

Quote:
On the nvidia homepage, madmodmike, who I believe is the guru over there, said in a post about 2 6000 series cards that sli only uses one cards worth of vram.


Is this a forum member called MadModMike? In which case, he's full 'o' shit.
March 24, 2007 3:17:38 PM

Quote:
On the nvidia homepage, madmodmike, who I believe is the guru over there, said in a post about 2 6000 series cards that sli only uses one cards worth of vram.


Is this a forum member called MadModMike? In which case, he's full 'o' ****.The MadModMike you know simply stole the name of Nvidia's tech guru character.

SLI does NOT add the memory together with ANY card pair, be it 8800GTXs or 6600GTs.
March 24, 2007 3:34:39 PM

SLI does NOT share memory between video cards.

It allows the exchange of timings and framebuffer info, along with 'list' requests (raw polygon and geometry data for each frame) so that the cards don't "step on each other's toes". Hence the cards incur a penalty in rendering the same data (though different frames) due to the nessesary exchange of data and timings.

Thus SLI is not 'purely' twice as fast as a single card.
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