FrostyTech has posted an Aopen ACP4LC Pentium 4 Heatsink Review

The Aopen ACP4LC is a tall heatsinks, standing a
whopping 98mm high, 55mm of which is taken up by the fan and adaptor. While the Aopen ACP4LC Pentium 4 heatsink isn't particularly revolutionary in design, or materials, it makes up for that with a bit of brawn, and an economical sticker price. On top of that, the Aopen's fan adaptor allows an 80mm Nidec fan to mount to the 70mm heatsink frame. The point of this, is of course to reduce the noise created by the fan by using a larger and slower rotating impeller. Combined, these two traits allow for a fan which moves more air slower than a smaller fan, but moves the same overall amount of air to keep the heatsink nice and cool.

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