HWGuru has a review of the AKASA Sierra Mountain P4 HSF.

"These days we have processors that kick out serious amounts of heat so we need good, efficient cooling with not too much noise and perhaps something colourful. The common trend in the air-cooled thermal solution arena is that heatsinks are getting bigger and better refined as thermal understanding gets better and innovation works towards the future. The AKASA “Sierra Mountain” as it has been dubbed, is a new huge copper heatsink and fan unit designed for P4 processors (so far) of today and tomorrow and as far as i'm aware we have the only one outside of Taiwan. "

It seems Alpha, Swiftech and Thermalright finally have some competition. Read on...