I just picked up a thermaltake water 3.0 for my 860k. I have an overclock of 4.5ghz w/ 1.44v I am running dual 120mm fans on the radiator, 120mm side intake, and a 92mm exhaust in a fractal core 1000 case. I have a thermal margin of 35c. I payed $35.00 for the thermaltake a Frys Electronics. Very happy with my purchase. The pump is quieter than my fans are.