The CNPS9900 LED's 120mm PWM fan spins at 1000-2000RPM depending on the temperature of the CPU and BIOS settings. Power is supplied by a 4-pin motherboard fan header that is backwards compatible with 3-pin fan headers. Standing 158mm tall, 140mm at its widest, the CNPS9900 LED is compact by Zalman standards. Three copper heatpipes are used, all 6mm in diameter. The fins leave a 59mm diameter hole at the front for air intake, 50mm at rear where the fan motor is housed.

The 120mm diameter fan is suspended 87mm above the CPU. In the 33mm space between two asymmetric donut shaped copper fin arrays (shown here with the clear plastic shroud on and removed). The space directly in front of and behind the fan motor is void. Mounting brackets fit over the nub of the cast aluminum base cap, or to either edge.

Each copper fin on the CNPS9900 LED heatsink measures 0.2mm thick. Fin spacing is 2.0mm at the outside, 0.5mm along the inside. The copper fins are soldered to the three 6mm diameter copper heatpipes.

The copper base of the Zalman CNPS9900 LED heatsink that makes contact with the processor IHS measures 32x32mm in area, and is a minimum 3mm thick. The surface is highly polished, and the three heatpipe ends are soldered in place to decrease thermal joint resistance.