Big improvement over my old single fan Cooler Master (? model) when I upgraded my CPU from an i7930 to a Xeon x5680, my CPU core temperatures were running at 90 degrees Celsius. Not good at all. The pump light on the old cooler was lit, the fan worked, and it should have worked, but did not. I went to Fry's and bought a new cooler with two fans and a radiator double the size of my old one, success. 45 C +/- idle, and 65~70 C +/- under full load. Seems acceptable to me and it's been running well for the past few days, all day long. I have a video editing workstation and I have it on for very long days. A bit more noise ? possibly, but not objectionable considering 2 GPU's with fans, and 2 other fans in the case & 6 HDD all purring away. The fans and radiator just fit inside the case by a few MM, but I could have mounted the fans on the outside of the case if necessary, I just prefer everything internal and was happy I could get it to fit.