Good gpu works on 650w power supply no problems. I've got it in a sgpc k55 case and when i put the aluminum side panel on the fans on this thing went into overdrive. Honestly the loudest fans i've ever heard and i've owned old laptops that sounded like jet engines before. Im not sure how much of it is the fans speeding up or how much is wind noise from having the the fans so close to the vents but i've chosen to keep the side panels off and I honestly really like the way it looks so im not bothered at all - very quiet too. But just as a warning if you've got this in a small build with fans right up against the panels you might need to tweak...view more