8800 GTS 320 slow please help

ok here goes i have evga 8800 gts super clocked and it isnt meeting the expectations of the benchies im seeing on games. my sys specs are as follows 170 opteron dual core 2mb L2 cache at 2400hertz,2gig ram 4x 512 sticks pc3200,7200rpm sata 3g seagate 320gig with 16mb cache,sound blaster audigy SE, 550 watt power supply with 2x pci-x connectors 2 18amp rails, and also a Asus A8N-VM-CSM mobo with 6150 onboard geforce graphics,nforce 430 chipset. with all up to date chipset,video,bios drivers. And im gettin like 60fps in Prey on the benchmark at 1024x768 with settings on low and every bench i see is around 156fps with same settings. Am i missing something here? i upgraded my 3700 A64 san-diego chip to the dual core optie and no difference really in company of heros im not even breakin 40fps on 1024x768 and all other bechies are around 63fps or so and thats with 4AA/16AF, im thinkin its my motherboard, its not the best gameing board buts it was the only thing i had at the time,any suggestions? also before the 8800 i had a 1950 pro 256mb radeon and still very crappy scores thanks guys

go into the nvidia console and turn off VSYNC. vsync makes your fps in games match that of your monitor which is defaulted to 60fps. with vsync on no matter what you do your fps will always be around there.

You said your motherboard has onboard graphics and you also had an ati graphics card before. Did you make sure that the old ATI drivers have completely been removed and that your onboard graphics has been disabled?

sidenote: how can mactronix make such an intelligent reply here yet ask basic questions on choosing which cpu to buy in another thread???

Yea that could be the kiddie right there.
Mactronix

im just guessing here as i dont own a 8800 and dont know its full capacity but have you tried knocking the AF down to say like 8, and see what the difference in fps is? 16x is pretty high and will cripple most cards im not sure if the 8800 will crank that out and maintain 100+ fps in those games. but definately check those old drivers and VSYNC.

This may be a dumb question but have you plugged in the 6-pin connector from your PSU to the video card. It just might not be getting enough juice.
Also, how long have you been using the PSU? It might just be time to get a new one...

Sounds like drivers or PSU, 2 18amp rails on a random PSU doesn't qualify for a 8800 worthy PSU. If you removed drivers properly and it's still giving you issues, then the only thing I can think of is doing a clean install and considering on getting a better PSU.