I will agree with IanY that in my system with a highly oc'd E6300 (3.7ghz) the Apogee GT beats the Fuzion by about 2c idle and 3c loaded. That's delta T loaded with TAT to the ambient air temp. It also had the same results during the Wednesday testing at CES with a Kentsfield. YMMV.

Yet I have a Fuzion on my CPU. Why? It has insane flow!! I have frankensteined a set of MCW 60 GPU block tops and mated them with the Apogee GT base. Now my 8800GTX's idle at 35c and all night runs of 3D Mark 06 only heat them to 40c. Kinda like the best of both worlds.

Everyone's system is different. If I only had a CPU loop, I'd go with the Apogee GT with the fat o-ring. I have a multi block loop, so I prefer the Fuzion because it preserves flow.