First some info about my system: Rig: I7 920, 6GB corsair dominator, Evga X58 mobo, Evga gtx295, sound blaster x-fi, 2x64GB ssd in raid 0, seagate 500gb hd. Liquid Cooling system loop: Resivor-->Pump-->2x80mm radiator-->CPU-->NB/SB-->3x120mm radiator-->Video card-->Resivor cpu/gpu waterblocks are EK and my NB/SB is bitspower. im using 1/2" ID hosing with anti-kink coils. My pump is a D5 made by swifttech. My question is why my CPU is overheating at idle speeds. Sitting in my bios after 5min. my cpu temp is at 83C. I checked my waterblock even and its on there secure. For awhile i thought my pump was bad, which it could be, but is it possible that my nb/sb waterblock is bottlenecking/restricting flow?