FrostyTech has posted a Dynatron DC1U-B02 1U Copper Heatsink review

For companies in the business of companies designing 1U server heatsinks the requirements that come into play are drastically different than that of a normal desktop PC. First of all there are the size limitations, and then there are the reliability factors. In virtually all cases there is some amount of forced air moving through the rack enclosure so some amount of passive cooling also comes into play irregardless of the heatsinks' features. However, with 'whitebox' servers comes the lack the engineering benefits that come part in parcel with designing an enclosure specifically for the application. Processor sockets may not be oriented for correct cooling by forced convention, it all depends and it's even harder to predict. The solution to such dilemmas could be to use an active heatsinks such as the all copper Dynatron DC1U-B02 cooler which features a squirrel cage fan up top. However, as there is generally no more than about 30mm of height for the entire cooling package, fans will obviously take up precious real estate.

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