I'm building a M-ITX computer with a 3770K cpu. The case and motherboard have room for one dual slot gpu. I need it to power a single 27" 2560x1440 display. I plan on playing fairly high end games. I'm looking for suggestions on GPU's that are powerful enough to maintain high frame rates on very high/ultra settings.
It doesn't really sound like you have a lot of choices - you want high/ultra settings at a very high resolution, which pretty much limits you to the very top end- a 670, 680, 7950 or 7970. You probably can get any of those to work just fine and at least with the reference coolers those all would fit into say, a Cooler Master Elite 120 or Bitfenix Prodigy, which I assume are similar to what you have.
Thanks for all the suggestions. Length of card isn't an issue. I'm trying to stuff all of this into a Silverstone SG-08 M-ITX case. My current GPU is a 580. But I didn't think it would hold up on the new monitor. The 690 would probably be best, but that $1000 price tag is rather nasty. I'll probably pickup the 7970.
A 7970 Ghz edition card can handle that resolution smoothly at mostly maxed out settings, you'll just have to tone down the AA settings and maybe one or two other settings in demanding games - not that AA matters much on a 27" panel at that resolution. Jaggies are really tiny