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Can I run these 580s with different RAM in SLI?

post #1 of 6
Thread Starter 
Hey guys

Im working on my build and I am either planning on getting a MSI N580GTX Lightning 1536MB or a MSI N580GTX Lightning Xtreme Edition 3072MB and I was even thinking to run them in SLI (Purchasing one at a time) but they have different RAM capacities. Does this matter?

Thanks
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post #2 of 6
They will work in SLI even if they have different RAM sizes. However, you will only get the 1.5GB RAM when in SLI.
    
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post #3 of 6
Thread Starter 
Quote:
Originally Posted by turrican9 View Post
They will work in SLI even if they have different RAM sizes. However, you will only get the 1.5GB RAM when in SLI.
So there would be no point of buying the 1.5 and 3.0? I should just buy 2 of the 3.0 gb?
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post #4 of 6
Quote:
Originally Posted by Pozpenguin View Post
So there would be no point of buying the 1.5 and 3.0? I should just buy 2 of the 3.0 gb?
Yes, you will need to buy 2 of the 3GBs to get full 3GB in SLi.
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post #5 of 6
Thread Starter 
Alright well Thats good to know thanks guys.
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post #6 of 6
Just so you know, the reason why this is the case is that both cards in SLI alternate creating entire frames. In order to perform properly, each of the two cards has to have it's own copy of all the same data. It's much like the way RAID-1 (mirrored) works with hard-drives ... whichever card has the lowest amount of vram dictates your total vram capacity. Any extra on the other card will always sit idle.
Edited by brettjv - 10/30/11 at 1:09pm
    
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