Standing just 45mm tall, the Evercool HPL-815 is a low profile heatsink suited for use in 2U thick computer cases. It's equipped with a top mounted 80x80x15mm PWM fan that rotates at speeds of 4000-1000RPM, exhausting air downwards into a 23mm tall array of quilted aluminum fins. In fact, of all the sub-60mm low profile heatsinks Frostytech has tested the HPL-815 ranks 7°C cooler (at 4000RPM fan speed) than the next best thermal solution.