none of those are working...
7600gs is around 150ish last time I checked or for less money the X1650 Pro..do you really need a new video card?
btw I used to have that proc and mine ran at around that speed on a gigabyte board..later I realised there was a switch on the mobo that changed the fsb.
CPU - E6400 Core 2 Duo @ 3.2ghz
Cooling - Zalman CNPS9500
Motherboard - Asus P5W DH Deluxe
Memory - OCZ PC2-8000 Platinum XTC 2GB (2x1024MB)
Video - BFG 8800 GTX OC
DVD - LG Super Multi
HD - WD Raptor 36gb
HD2 - Maxtor Diamondmax 10 250gb
PSU - Corsair HX Series CMPSU-620HX 620W
Case - Cooler Master Centurion 5
Sound - Creative Sound Blaster X-Fi Fatal1ty FPS