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Aopen ACK7L Copper Skive Heatsink Review
Aopen ACK7L Copper Skive Heatsink Review
Abstract: The fan adaptor of course reduces noise by allowing Aopen to use a larger fan, and hence a slower rotating impeller.

 Manufacturer  Category  Published  Author 
AOpen   Cooling / Heatsinks   Dec 26, 2003   Max Page  

Home > Reviews > Page: Close examination of the heatsink

Aopen ACK7L Heatsink From All Angles
The Fan:

Nidec have been a favourite, if often under used fan of us. The fans are built with glass fiber reinforcing in the plastic to ensure the best possible structural integrity. The ACK7L fan didn't come with a fan grill, but considering just how large this fan is I would suggest adding one of your own. The fan connects to a standard 3-pin motherboard fan header.

Heatsink Top:
This level of fin density is something you are not going to see very often. Each copper fin is 0.4mm thick, and spaced about 1.0mm apart. Each of the 43 sets of fins measures about 25mm wide and 25mm tall. The clip sits in a trough 6mm wide. The fan mounts to the shroud leaving approx. 3-4mm clearance from the tips of the copper fins.

Side A:
The entire heatsink stands 94mm high, with the heatsink itself taking up just 37mm of that height. The clip used on the Aopen ACK7L is only operable with a flat headed screwdriver, but it is not difficult to engage or remove from the socket. There is no protection from the heatsink sliding on the die in the event the computer is moved, so as with most heavy copper heatsinks, it is always a good idea to remove it first, then transport the computer. Since the clip uses all three tabs on the socket to keep itself in position it is less likely that the clip will snap off the socket tabs. It would have been best if the fulcrum point were keyed so that the clip would not slide within the heatsink.

Side B:
From a side view the number and density of the one-piece copper skived fins becomes apparent. Each of those 43 fins is only 0.4mm thick, and have been formed from material skived off the base copper plate. The fins and base plate are the same piece of copper though, and so there are no joints. The base of the ACK7L is rather thick, measuring it at a full 10mm. Most socket A heatsink base plates are rarely over 6mm in thickness.

Heatsink Base:

The base has been machined flat for the skiving process, and then once that was complete, sanded to achieve a smooth, but textured surface finish. A small patch of gray thermal compound comes pre-applied to the base of the ACK7L, which after testing with the straight edge is fairly even and flat at the center. From side to side there is a bit of a difference in heights, but this is not too uncommon, and as long as the central region is flat, that is all that matters.

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Table of Contents:

 1:  Aopen ACK7L Copper Skive Heatsink Review
 2: — Close examination of the heatsink
 3:  Heatsink Thermal/Acoustic Test Parameters
 4:  Surface Roughness Comparison
 5:  Final Temperature Results

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