The Heatsink Fan:
The 92x92x25mm fan set within the body of the Asus Silent Square EVO heatsink is PWM controlled. The fan spins at a quiet 2300RPM. Power is supplied over a 4-pin PWM compliant motherboard fan header and is backwards compatible with 3-pin connectors. Four blue LEDs internally illuminate the fan, which gives it a nice halo effect within the PC case. The body of the Silent Square EVO is 105x120mm

Heatsink Frame
With the fan shroud and 92mm fan removed from the Asus Silent Square EVO heatsink we get a better view of what goes into making this cooler. The heatsink is actually made of two separate fin arrays, each 100x32mm in size, and standing roughly 90mm high. Five 6mm diameter copper heatpipes work to ensure heat is conducted evenly across the intake and exhaust fin surfaces. At the center of the heatsink, a plenum on either side of the 25mm thick fan of 12mm is created.

Heatsink Side B:
Five 6mm diameter copper heatpipes weave through the body of the Asus Silent Square EVO heatsink. All joints are soldered. Each aluminum fin measures 0.39mm thick and is spaced 2.0mm apart from the next. If fin spacing were too tight the 2300RPM 92mm fan may have a hard time drawing air into the body of the heatsink, and even more trouble expelling it out the opposite side.

Heatsink Base:
The copper base of the Asus Silent Square EVO heatsink is plated with nickel to resist oxidation, and has a sanded finish. It measures 38 x 40 mm in size. The base surface is generally flat, but not perfectly so. Surface roughness is at or better than ~32 microinches, which is considered good. The five U-shaped heatpipes are soldered the base block and to the each of the nickel plated aluminum fins.