I recently bought an radeon HD 7770 and after installing it and updating my drivers I noticed 2 things. After booting up the computer the fan on the GPU doesnt click on, it only does so after I open the control center. After that it runs fine. Second when i launch a game it plays for a few minutes then crashes. Sometimes the whole computer crashes, but so far only 2 out of 7 tries. At first I thought it was my PSU, but its a 600w with a 6-pin connector, what the box and website recommend. Ive never had this prob with my old GPU (HD 6000-ish). Is it still my PSU or something else? Should I just go ahead and get a new PSU like a 750w? Any help would be great, thanks.