Hi First question: A friend of mine has this HP system, C2D cpu, nVidia graphics card. 3 Fans total: CPU, GPU and an exhaust fan (I'm not counting the PSU fan). Problem is that even when idle it wants to rev up, or in other words cool down.. I said to him "Well you have your system in a computer furniture, with limited space for airflow to circulate". Was I right about this, because when it starts to rev up I put my hand behind the system and can "feel" hot air from the exhaust fan. I know that HP doesn't know much about ventilating a case, but it has some small "holes" on the side door. But I feel that it's where the location of the entire case is that creates this heat problem. So any good solution?? Second question: If I was to build an heatsink, what would be like the "best" material you could recommend? I was thinking copper, maybe CNC a waterblock for cpu/gpu or give it a really really good lapping on it (I was thinking the best way is by using measurement tools by C.E. Johansson, it will be so flat, no air can get in between..).