Currently I'm running a 590GTX and looking to upgrade to (2) 770 2GB. Is 2GB of vram enough for 2560x1440 gaming? Skyrim with heavy texture mods is a concern. I was looking at 7970 3GB CF setup but I've read CF seems to have issues at the moment.
I would either go with 2 4GB 770's (Gigabyte makes a reasonably priced one) or take a look at the 780 for gaming at 2560x1440 (780's in SLI are perfect for high res set-ups, especially if you want to enable SSAA or other forms of AA). 7970's in Crossfire currently have some pretty bad micro-stutter and at this time I wouldn't go that route, that being said a future driver might fix AMD's woes, but I wouldn't drop $800's on 7970's with no garuantee of acceptable performance.
I was looking at the Gigabyte but I've always been a fan of the evga cards. The 780GTX is tempting but the performance of (2) 770s in SLI is hard to pass up for only $150 more.
770's definitely have the best price to performance ratio here, SLI 780's is really if you're just interested in totally pushing the limits. I've built machines with both EVGA cards and Gigabyte ones. I'll take the Gigabyte coolers over EVGA's stock fan any day, but if you like EVGA for their service, I can understand that.
I would either go with 2 4GB 770's (Gigabyte makes a reasonably priced one) or take a look at the 780 for gaming at 2560x1440 (780's in SLI are perfect for high res set-ups, especially if you want to enable SSAA or other forms of AA). 7970's in Crossfire currently have some pretty bad micro-stutter and at this time I wouldn't go that route, that being said a future driver might fix AMD's woes, but I wouldn't drop $800's on 7970's with no garuantee of acceptable performance.
I own the Gigabyte 4GB version and it's certainly a quality card. However keep in mind if you have a medium sized case the Gigabyte version will be a tight fit due to the length of the card. I had to move mine to the bottom PCI slot because there wasn't enough room on the top. Made for a nice freak out when I was initially trying to fit it.
I have considered SLI'ing it in the future, in which case I would likely get something like the MSI model which is shorter then the Gigabyte version by what appears to be 1 inch. Gigabyte version is 11 inches long.