Just rebuilt my 2.5 Quad but refrained from removing the CPU boards from the pump assembly. I wanted to replace the factory thermal compound, but didn't know if it would actually make enough of a difference. What is the stock thermal transfer medium? Thermal pad, or grease? All four cores are currently idling at 38ºC, which isn't bad at all, but I can't help but think I could've cleaned it out and maybe dropped the temps a few ºC with some Arctic Silver. Does anyone know if there is improvement to be made, or is the factory stuff good enough? It isn't *too* big of a task for me to pop off the processors now that I've done it a few times, but I'd rather not just incase I break something. It all feels so fragile.