i run the same card on a p5k deluxe with a 650w silverstone psu
it could be your generic psu or bad ram on the card or a combination of both
http://www.newegg.com/Product/Product.aspx?Item=N82E16817139005&Tpk=corsair+650w

 

It may be bad Ram on the graphics card but i dont think its the PSU becosue i triend 3 diffrent one's and the error was the same every single time.

 

ADD**

This sometimes happens 10 minutes into the game, sometimes 3 hours.
I installed the latest drivers and deleted the old ones using Disk Cleaner Pro so Drivers is not the issue.

 

if the 3 you tried were of better quality and higher wattage rma the card

 

is there a way i can test my card for flaw Ram

 

try it in another computer and see if it runs ok or has the same problem

 

Well i tried it on my older MB and it does the same exact response.

 

then if it's under warranty rma it or replace it

 

thanks.

 

let us know how you go with it