hi im having an ongoing proplem with my gtx 460 im getting masage display driver has stoped responding but has recovered and sometimes the system will shut down altogether it can happen straight after start up or during a game and sometimes not at all i have installed latest driver tried older driver installed correctly using driver cleaner everthing is up to date and system runs perfect apart from this really anoying when in the middle off something be greatfull to recive help i tried nivida for help all the said was to up date driver
Sounds like a memory problem. If possible, download a program called Memtest. It needs to be burned to a CD (it's an ISO image) and is a bootable program that you go into instead of windows. It runs data passes through your RAM to test it's stability. If there is any instability, it will root it out.
I had a similar problem to you and it was my RAM being a bit faulty. A simple RMA replacement and I was away again.
which one do you have exactly? hx620 or hx520? but leaving that aside both should be more than enough to run single GTX460. even mine was running fine just fine using gigabyte superb series 550w (yours are better than mine). i think you got faulty PSU. sudden shutdown is one of the symptom. maybe you got the error because the gpu can't get enough power to run properly. but you can test the gpu in another computer to see if same problem happens. if they did the gpu might faulty as well.
btw corsair is a good brand. i think you got the bad batch