In this review Frostytech is testing a 2U server heatsink for Intel Xeon processors called the Dynatron G555. The heatsink stands 67mm tall and uses a top mounted fan which impinges air downward into densely packed aluminum fins. The fan rotates at 5,5000RPM and moves upwards of 54CFM airflow at a very loud 67.8 dBA noise level. The 23x84x84mm PWM fan can slow to 1000RPM (8.4CFM) during low duty cycles and is rated to between 0.24mm-H2O to 5.6mm-H20 static pressure.