I have one on My system and it does pretty well.Smilodon Gaming Case, Asus P6T Deluxe V2,I7 950 @ 3.9gig Corsair 750 PSU, 8gig Corsair DDR3 1600, Velociraptor 300gig, Thermotake X-58 chipset fan&heatsink,MSI ATI-Radeon 4830x2(crossfire), Coolit Domino. With a thermotake 9900 heatsink and fan my temps were 71c-78c on prime95. Bought the coolit system and my temps dropped to 60c-69c, so it works pretty good. It's water and water removes heat better than copper and at this price it is the BEST water cooler for the price. For you diehard water cooling maniacs this thing is pretty good for the money.