OK this is gonna be fun, my current system is Pentium D820 @ 2.8Ghz (Stock), ECS p4m800pro AGP, BFG 6800GT 256Mb, 160Gb Sata drive, firewire, SBlive, LG 18x DVD-RW, not much but plays the games I like (NFS: Undercover is biggest requirement game, all others are like Halflife 2, DDO, Call Of Duty 4), well I just got a deal for $150 canadian, Core2Quad Q8200, ASROCK 4C1333GL, 2Gb DDR-2 1066, Seagate 500Gb Sata HD, New case.... Well I also decided to up the ante and got an OCZ 600 Watt PS, so now am wondering which Videocard to get that won't bottleneck with new CPU and can run my monitors native settings (1920x1200)? any suggestions? Preferably ATI...HD 5770? HD 4890? Like I said, gaming is not big as you can see( LAN party games consist of Quake 3, Unreal Tournament 2003 and Call Of Duty 4). Thanks alot, I trust you guys at Tom's because you seem more "knowledgable" then some others. Don't get me wrong, I am a Network System Specialist with 20 years working on PC's but when it comes to which CPU/Video work together, forget it. LOL. Thanks again.
Id say go for the 5770. Apart from having DX11 and other features you may or may not use, it mostly comes down to your CPU bottlenecking your graphics card. That Q8200 @ 2.33 Ghz will bottleneck the 4890 to much, in my opinion, though I will admit you will see slightly better FPS with games that can use 4 cores over the 5770.
Even a 5770 will be bottlenecked by the low 2.33ghz with games that only handle 2 cores, but seeing the list of games you play, that should not be to much of a problem as your FPS will be very high with those older games.
Try looking into overclocking your CPU, any boost however small will increase your performance greatly.
Well I do have a an OCZ Vendetta II HSF with 92mm fan/heatpipes and can probably OC to 1600FSB making the CPU @ 2.8Ghz, that should add some kick and possibly not bottleneck the VC as much, like I said any VC is an improvement to what I have but I just don't want to get bogged down.