In short, SilenX have tossed every popular heatsink technology into the EFZ-100HA1 heatsink and capped it with a languid 100mm x 15mm vaneaxial fan. Exhaust air is quietly directed down through the 17mm wide aluminum fins, so that's a plus. The single 100mm non-PWM fan rotates at 1000-2000RPM depending on the computer or manual fan speed controller setting. The entire heatsink weighs just 364 grams and installs onto Intel socket 775/1156/1366 and AMD socket 754/939/940/AM2/AM3 processors.