8800GTS Defective?

[davidtran007]

So I just bought an eVGA 8800GTS 320MB....

Installed the latest Beta drivers (169.09) and COD4 to test the performance. I am on XP Pro SP2 (Dual booting with Vista)

On optimal settings (1024x768) I am getting so much stuttering and according to FRAPS my FPS is around 10-20. The game is not smooth at all. It lags pretty bad. Crysis was even worst.

I have tried plenty other NVIDIA drivers with driver cleaning etc... Nothing seems to work. I have yet to reformat.

3DMARK06 ran totally fine but the scores are not even reasonable with my setup. My score was 4100 when it should probably be around 10K

Could my PSU (Antec Neopower 480w) possibly be the problem? Its pretty old. However it has Dual 12V rails with 18A and 15A. It ran my previous card fine (X1900XT)

Specs in sig. Cpu OC'd to 3GHz.

All input is appreciated.

 

[akhilles]

Your pc would need about 400w & 28a on +12v's. I don't think it's the psu. It sounds like before the beta drivers, your pc ran fine. I'd not touch beta anything. You can try reinstalling the old stable release.

 

[John]

Your psu seems fine. However you can test the 3.3/5/12V rails with a DMM (do not use software) during idle and load to see if they remain within ATX spec. The X1900XT and the 8800GTS consume around the same amount of power. When you say that you've tried driver cleaning are you referring to driver sweeper & driver cleaner?

 

[bakaris]

maybe download GPUz and check the specs to see if everything is reported correctly. I installed my gts in the wrong pci-e slot by mistake when I first got mine, so the bus speed was only 4x instead of 16x.

 

[davidtran007]

i tried stable and beta releases.... i used driver cleaner everytime i switched.

well i shut off my pc yesterday. turned it on 12 hours later and my cod4 is getting 100 + fps.

ran 3dmark06 and got 9600.

what could the problem possibly now? everything works fine after a long shut off. i don't expect to keep these frames if the computer for several hours

 

[davidtran007]

ok frames have gone back down the drain since the computer has been on now for several hours....

could the psu possibly be the issue here now?

 

[akhilles]

Could be the psu if it's been around for a while.

 

[zagood]

Sounds like something's overheating. Check your CPU temps with coretemp, speedfan, whatever, and your GPU temps with RivaTuner or nTune. Make sure you didn't disconnect a fan from your Rheobus, or turn off one of the channels.

-z

 

[imported_clockerspiel]

I had the same problem with the 480 Neo and a 7800GS. I took the side panel off and discovered the PSU was running hot (was subsequently heating up the whole box), probably caused by weakening caps after about two years of use. Swapped out with a Corsair HX520, and voila!...problem solved. Just a thought...

Good Luck!

 

[taltamir]

If I am not mistaken your CPU has a "safety downclock" where it automatically downclocks itself ALOT if the temperature gets too high... rather then just crashing and making it clear that something is wrong... check the temperatures on everything. And look for a part that is scaldingly hot to the touch.