Whenever I boot my pc it always tends to make a "grinding" sound. I do belive it is the pump.Swiftech MCP35X I installed had been in there for a couple of months. And it just started up recently. Does this mean I the pump is going bad? Temps are staying steady. I also have another question. I have two xfx 7970 in my computer. Would it be worth it to upgrade from generic blocks to the non-reference blocks that frozen cpu has for 120?