Hi all ! It's been a long time that I have the swiftec 226W pelt + Waterblock thing - MCW5002AT I think.... the only radiator I have is a small 12mm copper one, which is not bad ! but I never got my pelt running on it without the water very hot... even with 220v fan, and without cpu load on the pelt.... I guess I should better add that I am a "noise killer", which mean I hate noise Better dissipates heat (stronger fans) Totally quiet (behind 40cm wall) Heat rejected out of the room !! (It is very hot here in the summer, and when the computer is running it is even worse in this room !) the only "problem" that can happen is that tubes are a bit longer (currently ~25 feet (8m) ), and the need of stronger pump. but I don't mind at all ! since the stronger pump will be outside the wall - and I won't hear it !!! results for now: I can run the 226W Pelt + AXP OCed cpu load, without the water to exceed the 32*C, when outside it is ~28*C ! with the same radiator !!! I'm very glad ! anyways, I'm planning to add another radiator outside ! Please feel free to reply !