DOMINATOR Airflow fan is designed to be matched with the DOMINATOR heat sinks and allows even more heat to be removed from the DHX XMS2 DOMINATOR modules. The DOMINATOR Airflow fan unit contains three 40mm tachometer-controlled fans to provide impinging airflow to the memory subsystem. With the moderate RPMs required to provide adequate forced air the DOMINATOR Airflow fan is nearly silent. ... more info