Problem with 7900gtx and PSU

[chameleon_789]

I posted this at the nvidia forums but no-one seems to know..

So... whenever my GC is sucking up a lot of power, my computer cuts out (I had this problem before with a Geforce 6600GT and a different MB), for example I can play Fear for about 6 mins@1600x1200 before it cuts out, and about 15 mins@1280x1024. I assumed it was the power supply I've got, which is 440w, so I went and bought a 600w PSU. Today I installed it, and tried running Fear again at 1600x1200..

I loaded it up, and it worked for about 3 seconds before it cut out. So I unplugged the power cord (which is what I have to do whenever it cuts out before I can start up again), plugged it in again, switched it on, and... BANG. Power supply blew up, lol. I had to put my old one back in, luckily nothing got fried..

So anyway, I don't really know about power supplies so my question is, why is my PC cutting out all the time, is it the power supply, and why did this new one cut out so fast and blow up when my other one works for longer before cutting out and doesn't explode..?

I'm pretty sure it's not overheating, and the GC is definately not overclocked.

[john19055]

What is your system spec's and what power supply did you buy ,IMO I would get one that had over 30amps on the 12v rail.

[chameleon_789]

Ok, I added system specs to my sig. The 600w PSU was one I got off ebay so I'm pretty sure it's not a well known make.

Sansun 600w PSU:

DC OUTPUT
+3.3V 23A
+5V 32A
+12V 29A
-5V 0.5A
-12V 0.8A
+5VSB 2A

and the 440w that came with the PC:

DC OUTPUT
+3.3V 28A
+12V 30A
-12V 0.8A
+5VSB 3A

The Audigy 4 uses a molex, I have 4 IDE drives, a fan uses one, and the GC came with a splitter which connects to the GC and takes 2 molexs@12v, so that's 8 altogether. But I'm not too sure about PSU's or what difference that makes, if any.

[chameleon_789]

Ok, well I thought they were in my sig...

If it is the PSU, what do you recommend to replace it..?