Sunbeamtech's Twister 120 heatsink is for all intents and purposes based on a standard OEM design we've seen many times before on Frostytech. Standing 154mm tall, the Twister heatsink weighs 631 grams and ships with two 120mm fans that operate at speeds of 2000-1000RPM. Generally speaking, two fans are better than one when the fans are running at very slow speeds. Both of the no-name red impeller 120mm fans are non-PWM, so a manual PCI bracket fan speed controller is included in the package.