May I recommend you a HSF, its a Thermaltake Volcano 7 Cu+ with copper heat sink. It a nice HSF with a switch to control the fan speed. There actually 3 modes, Low, Medium and High. Its a 6800rpm max i think. If you leave the pc on during the night, you would want to lower down the fan speed through the switch, provided if you mod your case to enable the switch accessiblefrom the exterior of the case.