AOpen ACP4SH Heatsink From All Angles
	The Fan: The 70mm fan blows air through the copper fins and out the opposite side where there is a plenum. The two copper heatpipes can be seen poking through the top of the fan shroud, on either side of the bump. The fan connects via a 3-pin fan header on the motherboard and supports RPM monitoring.
	Heatsink Top: From the front, it is a straight path for cool air to enter the Aopen ACP4SH heatsink, and exit. The fan remains essentially flush with the copper fins. Note the clip which sits just in front of the fan, this can be difficult to engage onto the heatsink retention mechanism.
	Side A: From the rear of the heatsink you can see how the Aopen ACP4SH is formed from the skived copper base, and stacked copper fins with heatpipes. The copper base is about 8mm thick over the CPU, and the skived copper fins measure 0.5mm thick, with spacings of 1.75mm. The stacked copper fins are ~0.4mm thick, and spaced 2mm apart.
	Side B: The fan shroud serves two purposes, the first is to hold the fan in place, and the second to direct airflow through the copper fins towards the plenum at rear.
	Heatsink Base: The copper base has been machined pretty smooth, with a raised area for the processor to mate with. As this heatsink is used in a socket 478 frame with a socket 775 processor, the raised area is probably there to account for differences in CPU package height. The surface is very flat, and nice and smooth.