Graphic Cards :: Intermittent FPS Drops - GPU Not Running Hot

In various Games such as Dungeon Defenders, and the newly released Unturned; I receive drops in FPS for a almost set amount of time 10-15 seconds. Drivers are up to date. I've done several types of malware scans, and DxDiag brings up no problems.

I go from 60 FPS or higher, to (depending on game) 8 FPS-20 FPS. Shortly after the drop, it goes right back up to 60 or higher FPS. and does the same intermittent drop for a short time.
Temps do not exceed 60C, if they even get that close.

Really getting to me, as there are no apparent reasons for this to be occurring. The speccy screenshot below is while a game is running.