Originally Posted by Qu1ckset;12801251
I had xfired hd 5970 and never had a problem, and the scaling is much better on the 6*** series cards , i just switched to nvidia to give them a try, but I regret not waiting for a pair of 3gb 580s, because games are unplayable @ 2560x1600 with AA on , due to lack of vram. They should really make the vram expandable . At op if you want the best setup and money is not an issue , get either 2way sli/ 3way sli 580s or hd6990 and hd6970 in xfire
Consider yourself lucky to not have problems with the 5970's.
I agree AA is an issue at high resolutions. I can't go past 2X-4X in most games in Surround on my GTX 570's, and some I can't even enable at all. While I like having all my game settings maxed out, it's not entirely game breaking to have a bit of aliasing here and there.
On your point about having the RAM expandable, this is a limitation to Nvidia's architecture as the memory interface is fixed to match up with the amount of RAM. So for the GTX 580, 384-bit multiplied by 4 banks (3 memory chips in each) which gives you 1580MB of VRAM. Similarly, that's how we achieve the 1280MB VRAM with the GTX 570, due to the 320-bit memory interface. It just would not be possible to give 2GB at this point. However, the GTX 550 is the first attempt that Nvidia has made with mixed memory interface and chips so there is hope for the future.
I also feel the VRAM issue is being overstated here (in the the forums in general) as well. Only 1-2 short year(s) ago, we were still using 1GB VRAM for most high end cards and even then there were many people who used Eyefinity, Surround, and/or 2560x1600 displays with those same cards. Sure there were VRAM concerns back then too, but hardly many complained about this being an issue until the 2GB cards really started rolling out in the last few months. I feel this topic is going to steer into the same direction as micro-stuttering and bottlenecking where people exasperate an idea and take it out of proportion.
For what it's worth, I monitor my VRAM usage in Surround, and there are only a few titles where I am constantly hitting my limits and notice a severe drop in performance. Most everything else plays well even on my cards, which is why I'm sure "regular" GTX 580's should not have much problems as well at my resolution. (I'll confirm that in a few short weeks when my Step Up completes.
)Edited by covert ash - 3/20/11 at 11:18am