SKUD,
In Sli you don't double the ram of one card unfortunately, so your 590 (2x580's on one card @ 1.5gb V/ram) shouldn't give 3gb of ram only 1.5gb. The 580 with 3gb therefore is the reason of better performance. We will have to wait and see if the patch is going to address the V/ram issue. I have 2x1gb cards in Sli and both are working to full capacity indicated by my precision tool. I think at the moment V/ram or lack of it is some of the reason that those of us with 1gb are noticing more problems than those with 1.5gb or more. My frame rates are very good but the stutters down low are a pain.
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Rick
Asus M4N98TD-EVO
AMD Phenom2 965 x 4 3.4gig
8gig DDR3 Ram
2x GTS 450 Sli (1gig each)
1Tb HDD Partitioned x 5
700w Coolermaster single rail P/S 52a
Windows 7 64bit
19" Samsung 931BW monitor
1280 x 960 Resolution
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