[citation][nom]Nemo888[/nom]I went with the h50 on my i7 920 oc'ed to 3.4Ghz at stock voltages. The included fan is inaudible and very low flow. I used it for exhaust and then just put the fan I had on the back and bolted it on the other side of the cooler to push/pull. I played Crysis last night and the cpu hit 27C. I must also add that this was the easiest install of an after market cooler I've ever had. It took 6 minutes to install and have it back up and running.Use the same fan dude, this article compares an inaudible fan with a blender. The inaudible fan is up to the task of cooling an i7 at 3.4 though.[/citation]
The Corsair H50 fan is quiet, not inaudible, but normal people will probably need to be around 2 feet away or closer to hear it over normal background noise in a semi-quiet room. The pump is almost as noisy as the fan, but paired together most people probably won't notice one over the other, or even hear the combo over other noises in the room once the cooler is installed in the back of a case.
But the CoGage True Spirit cools as well, and is even a little quieter. Normal people in normal rooms will have to sit very close to both of them to hear the difference.