VRMs and memory chips are different. Memory chips are usually the most resistant to overclocking.
Originally Posted by Compaddict
I am concerned enough over this to consider selling my 3x GTX570's and get GTX580's replacements. I'm so glad the EK blocks I have coming fit both cards so that's not an issue with my decision. Seriously, what would you recommend? I need this rig to last 5+ years if possible. I just may have my credit card payed off by then.
As much as I think this issue is overblown, I would say consider two 580s. My reasoning on this is the extra bit of VRAM will give the card more longevity, especially since you use 3 monitors. 3GB 580s if you can manage the increased cost. The reason I say this is that I don't see the 570 as a long-term solution, since it's so powerful processing-wise but vram limited going into the future. Especially in a tri-setup, 1.25GB of vram just doesn't allow the cards to breath.
Basically, 3 570s have more raw power, but 2 3gb 580s have a lot more consistent power, where the 570s will faceplant if they have to hit that vram limit, and at your resolution, that could easily
be only 4x or 8x AA.