Hello I just received a recertified gtx 770 to replace my r9 280 that was giving me a bunch of issues. I have tested it on a few games and seems to be running fine no overheating or anything but when I run it in gpu z the voltage readings flicker from .9-1.2 and no information about every .1 seconds. The r9 280 I had in before kept constant vddc readings and I am wondering if t here could be something wrong with the card? I have a Rosewill Valens-600M gold series psu. The card also keeps a coreclock speed of around 150mhz when not in a game, but I assume this is part of its power saving feature..