I am thinking about upgrading my rig to a Sapphire 5770 vapor-X. I have a BFG NVIDIA 9800 GTX.
Some concerns I have is the 5770 will be bottle necked by my CPU. My rig specs are ASUS P5K-E MOBO. 4 gigs ram, WIN 7 PRO, and my CPU is Intel E8400 dual core 3.0 ghz. I will probably upgrade in a 1 1/2-2 year time frame. I play games in 1680 x 1050 resolution. I still think there is life left with what I have. Any recommendations would be greatly appreciated.
Your cpu is still good, although OCing it is a good idea. It OCs easily and well.
The HD5770 will give you DX11 and an extra 25ish% performance. If you can afford it and your resolution is 1920x1080 or higher you may want to wait for the HD5830 which should be available very soon and offer a more substantial upgrade.
Jyjjy is exactly right. (thats probably why noone else jumped in here)
1. The e8400 is still an excellent gaming processor. (I also have it) If you look at toms gaming CPU hierarchy you will see that it still ranks near the top because of his high clock speed and somewhat muscular cache. It will not bottleneck most cards.