i'd tried to lapping the CPU heatsink on the jet 4 and i got a reduce in temp around 1-2 cels......hihihih...i oso dunno issit bcoz the mirror finish or just the gold color thermal grease from CM.....well at least i got around 48-49(now) 50-52(before)<-- Bios and Core Center Reading.....If the aerogate around 36-37 idle....40-43 full 3D..... :o