I want to upgrade my graphics card, and I was considering a 4850, 5750, 4870, or a 5770. Couple of questions:
1. The 4800 series and 5700 series are comparable in price right now. Is there any reason to choose the 4800 series over a 5700? From what I can tell, the 5700 series are more power-efficient, have better cooling, and have DX11. Anything I'm missing?
2. Would a 4870/5770 be overkill for this system? In particular, is my processor good enough to warrant one of those two cards, or should I go down a notch to a 4850/5750 card?
At 1366x768 a 5770 will do great. As far as you're going with your 4800 series and 5700 series comparison the 4800s eek out a slight performance advantage right now. Either card aren't really an overkill as they're average up to 1680x1050 and do okay at 1920x1080, but aren't anything amazing. It's a mainstream card, and it'll last you for a while, even if you want to upgrade your monitor.