I've noticed this once before on this system, and was just noticing it again as I was changing some hardware. And let me just say, while I probably use a little more than above average on the thermal grease -- I am not putting it on there like ketchup or anything like that. The heatsink (hyper 212+) can be slightly turned with a little bit of effort (not by simply touching it) while fastened to the CPU. The cooling on the CPU remains idle around 30, and running realbench does not break 55. So, there is apparently no issue with cooling. I am more curious to just know what people think of the fact that it does move in general on there. The screws are tight as they should be.