What GPU for my CPU not to bottleneck?

Universal11

Honorable
Mar 30, 2013
1
0
10,510
Hello! I want to know the BEST GPU I can get in order for my CPU not to bottleneck it. Here are my specs:

Mobo: Asus M32n-SLI DELUXE
Cpu: AMD Athlon X2 Dual core 3800+ (2.0 GHz)
Current GPU: Nvidia 8600GT 256mb RAM DDR3
Ram: 4GB DDR2
HDD: Seagate and WD both 7200rpm
OS: Windows 7 Ultimate 64bit (7600 build)
DirectX: 11

How would a Nvidia Gtx660 do? Cheers!