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Do graphic cards share memory in SLI ?

post #1 of 23
Thread Starter 
ok i have 1 gtx570 and its is 1.2gb version....suppose i pick 2 more 570s so total 1.2*1.2*1.2=3.6

so will it be 3.6 or the memory will be 1.2 for all of the 3 cards?

i am confused in this sector...

some help would be great

thanx:)
     
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post #2 of 23
The cards would have a total of 1.2gb to use.
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post #3 of 23
1.28gb for three cards. They run mirrored.
    
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post #4 of 23
No, they don't. Each card has a mirrored copy of the VRAM of the other. You only have as much usable VRAM as one card.
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post #5 of 23
Only 1.2 gigs usable. Very few games really need that much VRAM.. what are you using your rig for?
post #6 of 23
Thread Starter 
Quote:
Originally Posted by mingqi53 View Post

Only 1.2 gigs usable. Very few games really need that much VRAM.. what are you using your rig for?

just heavy gaming...as of now 1 570 is not doing enough for me cant totally maxx BF3 out along with metro 2033 and few other titles and i playing at 40'' 1080p.....and i enjoy playing at bigger screens
so is 2 or 3 570 will be enough to maxx out every game to the limit at 1080p?
even i have the chance of selling this 570 and jump in the GTX580 SLI bandwagon...would u guys suggest that ? i just want SHEER performance
     
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post #7 of 23
Even through cards process in parallel there is no way to predict which part of the code each one will be responsible to. The order of the execution of the instructions is also unpredictable at some level. All this means that each card needs a copy of what's on the memory, so your 1.2 will be filled exactly the same on both cards, therefore you will have (1.2+1.2) / 2 = 1.2GBs of ram.

On dual card like the 5970 or gtx 590 they explioit this as a marketing gimmick to fool unaware people.

But don't worry,. few games and apps will much that much vram. What occupies the most of it are the textures, which means the higher texture resolution is, the more ram you will need. Monitor resolution is also a fact. I would say that more than you have is only necessary nowadays for triple monitors setups.



As for your performance, looks like that will be more than enough for a while. I would risk saying that for almost 2 years you will be maxing out everything with 2 570s.
But that's not as simple as a yes or no question. When I don't "max" out a game, I simply reduce AA, for example tongue.gif
But by the look of things, we will only see improvements in the quality of games once new consoles are released because they are pushing back the advance of computer games.
Edited by EduFurtado - 11/20/11 at 7:22am
post #8 of 23
Thread Starter 
thanx for clearing it up guys....but will 1.2gb would become a limiting factor for 3 gtx 570? will the VRAM hold the 570s to unleash? or at 1080p i don't have to worry about VRAM?
     
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post #9 of 23
Quote:
Originally Posted by naved777 View Post

thanx for clearing it up guys....but will 1.2gb would become a limiting factor for 3 gtx 570? will the VRAM hold the 570s to unleash? or at 1080p i don't have to worry about VRAM?

I had a 5970 and a 5870( 1gb of Vram usable ) going one time for crossfire action on 1200p. I've ran Crysis 1 fully maxxed settings and after about ten minutes of playing, my Vram usage was plum out and started to use the system's ram. That made the game crawl. Imo, there isn't enough Vram for tri-Sli 570s on 1080p. Two would be fine though. I've had no problems with two 480s @ 1200p maxing games.
    
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post #10 of 23
If you need 800mb of vram at 1080p with one card you will need 800mb of vram at 1080p with 2 or three cards, so yes, it will be enough.

However at that resolution 3 of these cards seems to be a waste, I would stick to two.

As for the guy above me, I didn't know you could see how much vram you were using on 5870 cards......
It also doesn't make sense to use that much of vram
Edited by EduFurtado - 11/20/11 at 7:47am
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