Can you tell us a bit more about your benchmark system? Specifically the CPU itself and the case.
Speaking for myself, I went with this fan based on your recommendation and have been thoroughly impressed. I am running an i7-920 D0 stepping in a HAF 932 case. I've got it stably overclocked to 3.8 GHz and with the temperatures I'm seeing, I'm sure with a lot of work I could go to AT LEAST 4.2GHz before I'd have to worry about the CPU. That said, 3.8 is "fast enough" especially with turbo mode still on. My temps are around 29C idle, 55C prime95'd in a room that's 21C ambient.
I was also highly impressed by the build quality and ease of installation. I was a bit frustrated that the HAF 932 cut-out doesn't take into account LGA1366 boards, so I still had to remove the motherboard, but that only takes a few minutes.
Bottom line, I have this fan, I would recommend it if your case will fit it, you won't be disappointed.
