Originally Posted by ranerX3
590 for sure the extra memory will be handy in 3D or surround and both of them need lots of it.
The GTX 590 only has 1.5gb effective vram. Sli, x-fire, or dual gpu solutions do not multiply the vram from each gpu. If you had 2 GTX 590's in 4-way SLI, you'd still only have 1.5GB effective vram. The gpu's are discrete, and so is their respective vram. Dual gpu cards are nothing more than two discrete graphics cards fused into one. They still even rely on SLI or X-fire technology and coding to link the two gpu's together. Its basically just a way to get two cards into one slot. Its always been this way and probably always will. This is pretty basic stuff guys, considering these technologies have been around for well over a decade now. Blame the damn manufacturers for misrepresenting their dual GPU solutions, or blame yourself for not knowing a very basic principle of graphics scaling.
Fret not, Nvidia fans. EVGA is releasing its own GTX 580 3GB card this month. Two of these in SLI will handedly play anything maxed out in a 5760x1080 res, and probably 5760x1200 as well.
From the benchmarks I've seen of the Palit GTX 580 3GB (these are apparently not available anymore and I guess had some bugs), this extra ram allows the GTX 580 to really breath and pretty much trumps the ATI 6970 at ultra high resolutions.
I have a GTX 580 SLI set-up and play at 5760x1080 and there are times that I wish I had a 6970 X-Fire set-up because I know I wouldn't be bottlenecked as much by vram. I am going to donate these cards to my brother's rig and get the EVGA 3GB cards as soon as I can get a pair.
As to the OP's poll, bang for buck, I think that 2x 6970's is a really good option and seems to handle triple monitors fairly well. 570's SLI for triple monitor is really not a good option. I also never recommend dual gpu cards. They never scale as well as two discrete cards and heat is almost alway an issue. The only solutions I would suggest are 2x 6970's, 2x 580's, or wait and get the best solution which will be 2x 580 3GB's. The X-Fire 6970 and SLI 580 1.5 gb are very close, but the ATI card would be about $300 cheaper for 2 of them. So...there is quite a difference in price. The GTX 580 3GB will be around $600 each, so it sort of puts them in another category, one with definitive diminishing returns. But, if you want to play every game under the sun in 3 screen glory, this will be the only option, as even 3/4way X-Fire and 3/4-way SLI will have nothing on a pair of 580 3GB's as far as total playability at max settings.
Forget about 3D, at least for now. Get into surround gaming. Its all that and a bag of chips. Don't get me wrong, 3D is great, but surround is so much better, and until I can play 3D in all 3 screens at the highest resolutions and graphics settings, I'm not gonna bother, because of now, nothing is that powerful, and it might be a while before something is.