Okay i just want to know how can they say its not hitting the vram wall? Afaik not only aa and other post rendering effects require vram but also its a necessity when you render shader heavy games at ultra high resolutions.
The gpu fetches more and more instructions from a larger vram and renders simultaneously thus reducing performance downtime. Now increasing a resolution significantly hampers this directly and vram shortage will lead to gpu bottleneck.
My question is 3 gtx 580 1.5gb can beat 3 6970 cfx at 1920x1080 or even 2560x 1200.
But why it can't perform as well in 5760x1200? Forget aa , ssao and others. I think vram matters here. Those guys can test a 3gb trisli versions and prove us all wrong that vram doesn't matter here. But they won't.
I am not saying the review is unfair cause the 1.5 gb version of 580 is available widely and not the 3gb one as it wasn't part of nvidia's reference model.
Gpu scaling largely depends on
alternate frame rendering, supertiling (cfx only) , split frame rendering and vram. All these factors matter and vram has a large role to play.
Compare a 6950 2gb trifire with a 6950 1g trifire and you will know. The 2gb version will lead significantly @ 5760x1200 despite both of them sharing same die. Tomshardware mentioned in their review that 580 was running into vram limitations at 2560x1200. So there's no doubt that 5760x1200 is too much for it for competing against 6970 trifire.
Check the following:
Two 6990 in cfx vs evga 580 3 way sli @ 2560x1600
^^ That's 4gpu's vs 3 If we put some simple logic here rather than blindly believing those hardocp guys, we find that 3gf110 dies are putting well against 4 cayman dies at 2560x1600. They will definitely beat a 6990+6970 trifire at these resolutions. But its performance goes down when 3 monitors come into play. So i see a clear vram deficit that hampers scaling of the 580's while rendering shader heavy games like metro, crysis etc.
I am not the one thats gonna blindly believe those hardocp people that vram isn't a bottleneck because they are saying so and not even those silly user comments in that site.
Infact, I'm myself surprised from this.
at the settings it could easily play.
