The Dynatron G556 was originally designed for LGA1366 'Gainestown' Intel processors of a TDP up to 130Watts. In this review Frostytech will be testing the 64mm tall G556 heatsink with a 200 Watt heat load. The G556 2U server heatsink uses a top mounted fan which impinges air downward into densely packed aluminum fins. Given the maximum heatsink height within a 2U server chassis is >70mm, that doesn't leave the fan whole lot of room to breathe, so Dynatron have selected one with no side frame - essentially allowing air to be drawn in from 360-degrees.