BFG 8800 GTX OC 2 Issues

Hey, this is my first post here, but i generally just read these fourms.

Okay here is my issue maybe someone can help.

I got my 8800 GTX in may 07 and it worked perfectly up untill 2 weeks ago when I had to RMA it. So I get it back and it works perfectly for 2 days. Then after that problems again. Here's what happens, I load up ut3 and I can play it for about 10 to 15 minutes. After that it just starts hitching and by hitching i mean cpu usage goes to 100% and the screen freezes, I hear some ambiet sounds in UT3 for about 10 seconds than it resumes and it keeps doing this. Other games what happens is it will work anywhere from 10 - 30 minutes and it just craps out. Sometimes I get a stop error for a driver, even a few times its crashed back to desktop and the resolution and color is all messed up. Im just really frustrated because I have tried everything and do not know what to do now. Also I should mention that after taking the card out and putting it back in games seem to work longer but after the first crash it just gets worse, untill i reseat it.

Anyways ive checked alot of things inculduing the temperature and the hottest it has gotten is 84C. So its not a heat issue.

Here are my specs
Xp 32 bit
P5n32-E SLI
E6420 @ 2.66GHZ
BFG 8800 GTX OC 2
2 GB Corsair XMS 2 pc8500
PSU Thermaltake Toughpower 750W (Specs on the following link)
http://www.newegg.com/Product/Prod [...] 53036#spec

Anyways maybe someone here has some ideas for me to try.

Run a memtest.

See if there's a new BIOS available for your mobo.

Check the voltage output of your PSU under load.

RMA it again and you'll have the same problem. I doubt it's the card if they sent you another already.

What's the voltage output on those 12v rails?

you can buy a tool, but a good place to start is speedfan.

I've had nothing but bad experience with BFG. Got a 7900 GT from them for SLI, which fried in a matter of a few months. RMAed it, and they sent me an 8600 GTS (not the equivalent to the 7900 GT, which would be an 8800GT). To top it off, the metal backing of the card where the DVI ports are was grossly twisted and bent, and it didn't even come in a box, just a plastic sheath. I will never, never, NEVER buy BFG anything again. I'm going to send back this hunk of junk they mailed me, get whatever they'll give me, and ebay it.

Well I finally got around to trying a differnt card in my system. I put in a 7950 and what do you know no problems. So it indeed looks like I got sent back a bad card from the first RMA.