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Apack Zerotherm CF800 Socket 775 Heatsink Review
Apack Zerotherm CF800 Socket 775 Heatsink Review
Abstract: It has been designed to operate quietly, with the ability to scale the speed of its translucent fan automatically and tackle heat loads as high as 130W.

 Manufacturer  Category  Published  Author 
Apack   Cooling / Heatsinks   Nov 20, 2006   Max Page  

Home > Reviews > Page: 360° View - Apack Zerotherm CF800 Heatsink

360° View - Apack Zerotherm CF800 Heatsink
Information on Frostytech's test methodology is available here.

The Heatsink Fan:
The translucent clear (non-illuminated) 95mm fan spins at a speed of 800-2300RPM depending on the temperature of the body of the heatsink. The fan produces anywhere from 35 dBA to 48 dBA according to our real world measurements. A thermistor located in the center of the aluminum fins ramps up fan speed when the temperature reaches 40-48°C. The fan draws power from a standard 3-pin PWM fan header.

Heatsink Top:
With the fan removed from the center of the Apack Zerotherm CF800 heatsink, the construction of this heatsink is clearly evident. The four nickel plated copper heatpipes are each 6mm in diameter, and intersect the cooling fins evenly across its surface; at the base the heat pipes are closely spaced to absorb as much heat as possible from the CPU itself. Each aluminum fin measures 0.3mm thick and is spaced 1.2mm from the next. The copper heatpipes are soldered directly to the forged copper base, but not the fins.

Heatsink Side A:
The body of the Apack Zerotherm CF800 heatsink stands 45mm tall, and the heatsink has an overall height of ~79mm. Note the side vents in the fan support frame - these allow warm air to exhaust out the sides more easily. The large die cast aluminum base frame works with four spring tensioned screws, and these apply the correct amount of pressure to the CF800 heatsink on the LGA775 socket. This part also conducts a fair amount of heat although there are no cooling fins attached to it for some reason.

Heatsink Side B:
From the side we can see the Apack Zerotherm CF800 heatsink we can see right through to the fan impellers - so it's a bit strange that this fan isn't internally illuminated by any LEDs. The four nickel plated copper heatpipes reach out from the base of the cooler where they are closely located, and spread out through the body of the cooling fins to evenly distribute the heat. Joints between the copper heatpipes and aluminum fins are not soldered. From this side you can see the internal passageway formed in the aluminum fins, and the thermistor which is located inside of it (the two black wires at center).

Heatsink Base:
The copper base of the Apack Zerotherm CF800 heatsink measures 32 x 32mm in size. The copper base is ~2mm thick over each heatpipe, and 5mm thick in total. The four heatpipes are soldered directly to the copper base, but the copper and heatpipes are only joined with thermal compound to the upper die cast aluminum component from what we can tell. The heatsink comes with a pre-applied swatch of thermal interface material already in place, so installation can move quickly. The copper base plate is flat, and has a sanded finish. Surface roughness is on the order of ~63 microinches, which is considered satisfactory. Note the large die cast aluminum mounting plate here.

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Table of Contents:

 1:  Apack Zerotherm CF800 Socket 775 Heatsink Review
 2: — 360° View - Apack Zerotherm CF800 Heatsink
 3:  Acoustic Comparisons and Base Surface Quality
 4:  Intel LGA775 Heatsink Temperature Comparisons

List all Apack heat sinks that Frostytech tested?

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