It's been a while since we spent time at the test bench determining the thermal performance of a 1U heatsink, but here we are again. In this review, the heatsink manufacturer CoolJag (a division of Dynatron) has submitted to Frostytech the CoolJag E44C/180 heatsink. The E44C/180 is a fully copper skived heatsink which is actively cooled by a thin squirrel cage fan that rests on top. The entire heatsink measures 28mm in height, and fits into a standard socket 478 wire-clip retention frame. These types of retention frames were popular with the socket 423 Pentium 4 processors for a while, and have now been retasked to 1U requirements. The CoolJag E44C/180 is available through SelectCool.

Given that a 1U of space in a 19" rack equates to a server 1.75" thick, there is typically no more than about 30mm of vertical space for the entire processor cooling solution; heatsink and fan. Most commercial servers will tend to use fully passive heatsinks, and engage airflow with the use of an array of 40mm fans.

For smaller servers, handling Firewall or VPN requirements, less noise intensive cooling solutions are used for what is in most cases a standard desktop mainboard inside a small 1U server chassis. For these applications, the copper skived heatsink and squirrel cage design make sense. For production critical servers, it is always best to go with passive heatsinks and forced air from case fans.

	Heatsink Specsheet: Model: E44C/180 HS Material: Skived copper Fan: squirrel cage fan, 2100-5400RPM, 12V, 0.40A Fan Dim: 15x60x60mm FHS Dimensions: 28x88x62mm Weight: approx 467 grams Made by: Cooljag Sold By: www.selectcool.com