That's a wrong suggestion. The single 590 only has 1.5GB of VRAM for each GPU PLUS each of the 580s in it is underclocked and can not reach to same OC as two 580s in SLi. QuadSLi 590s is heavily limited by that VRAM and the underclocked 580 gpu in each. I stand by the recommendation of 2 x 3GB MSI Lightning Extremes.
By doubling your cards you are not doubling your vram.
Also, 3gb of ram is much overkill for a 1080p setup - 1.5gb will do it easily - however, it can pay to be future proof. But if your investing in a 120hz monitor (which you will love by the way) and 580 sli, I imagine you will be planning on using this setup for several years, if I were you I would just stick with 1.5gb to save money. Honestly and sincerely, 1.5gb is all you will ever need for rendering 1920x1080 frames. I have yet to need any more vram with my 1.25gb 570s. The 3gb cards were made for eyefinity in mind, or 1600p setups which have more then double the pixels of a standard 1080p monitor. Also, theres no point using 3 monitors when you have a 120hz monitor, because you can not run the middle one on 120hz unless you bought two more 120hz monitors, then you would be trying to run 5760x1080 resolution which is 3x the size of standard 1080p, at 120fps, which would just be insane.
But one thing is for sure - you cannot go wrong with 580 sli, and I would recommend the lightning ones. 580 sli and 120hz monitor, would be so much win. Do it!!!
Edited by jacobrjett - 11/5/11 at 3:37pm