x1950xt problem, possibly my PSU?

I recently bought a sapphire x1950xt (http://www.newegg.com/Product/Product.aspx?Item=N82E16814102067) and after setting it up with this LOGISYS 575W PSU (http://www.newegg.com/product/product.asp?item=N82E16817170017) with 450 watts of true power and 25A on the 12v rail. I booted up and installed the drivers, but experienced terrible performance out of the card. It was then that I realized the x1950xt recommended minimum 450W and 30A on the 12v rail and my cheap PSU only gave me 25A. So I bought this COOLER MASTER eXtreme Power 650W PSU (http://www.newegg.com/Product/Product.aspx?Item=N82E16817171014) with two 12V rails @ 18v each. I thought this would solve the problem, but this time after physically installing the card, whenever I tried to install the drivers or do ANYTHING graphically involved (running a game or application to test if the card was working..) my comp would restart or shut off altogether. Does this sound like the fault of the PSU or the gfx card? Is the PSU not powerful enough? (I thought it should have been plenty since others said they ran 8800GTX's on it / 7900's in SLI but I guess you never know!) or does it sound like a faulty card/PSU that I should RMA?
thanks for your help in advance, any responses would be gladly appreciated!
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  1. The coolermaster has plenty of power for that card, but more details about the rest of your system would be handy ;)

    Btw, the 30A mentioned is not just for the card, but the whole system combined. If it were just for the card... well... imagine 360W mostly wasted as heat pouring out of the back of your case. Not to mention the noisy triple slot cooler needed to keep it running under 150C.
  2. e6300, gigabyte GA965P-S3, big typhoon cpu cooler, 2 case fans, 1 gig pqi turbo 667 RAM, 160gig seagate hd
  3. Is this a fresh OS install?
  4. no, not a fresh install, I'm replacing my 7600GT with this card, but I made sure to get rid of all nVidia drivers before I tried to install the x1950xt and it's drivers
  5. maybe run memtest to see if it's your ram?
  6. what exactly do you mean by terrible performance?
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