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Akasa Revo AK-925 Loop Thermosyphon Heatsink Review
Akasa Revo AK-925 Loop Thermosyphon Heatsink Review
Abstract: Unlike heatpipes which typically use water under a slight vacuum for working fluid, the Revo heatsink is slightly pressurized with a fluorocarbon called R134a. R134a has a boiling point of -26.3°C at room pressure, but in the hermetically sealed system at a slight pressure that boiling point is raised to a level more appropriate for this application.

 Manufacturer  Category  Published  Author 
Akasa   Cooling / Heatsinks   Jan 01, 2011   Max Page  

Home > Reviews > Page: 360° View - Akasa Revo AK-925 Heatsink

360° View - Akasa Revo Heatsink

Information on Frostytech's test methodology is available here.

The Akasa Revo uses a 92mm PWM fan to move air through the 16mm deep fluid-to-air heat exchanger (aka condenser). The effective fin area of the aluminum heat exchanger measures 95x87mm in size. The actual fins are 7mm tall, >0.1mm thick.

From the top we can see how simple the Akasa Revo heatsink is and the carefull orientation of pipes leading from/to the evaporation chamber. Shown at left is how NOT to mount the heatsink. At right is the CORRECT orientation - the heat exchanger must be higher than the CPU block (fan removed for clarity).

One aluminum tube leaving the evaporation chamber is 8mm in diameter, the other 10mm in diameter. The entire heatsink is constructed from aluminum components brazed together for a hermetically sealed system. The heatspreader on the base of the evaporation chamber is 4mm thick, the chamber 20mm tall to facilitate proper boiling of the working fluid.

The aluminum base plate measures 45x45mm in size. From the rear you can see the very thin aluminum fins of the heat exchanger and the 2mm wide fluid pathways for the hot working fluid to pass through.

Base Finish and Flatness

Flipping a heatsink over to inspect the business end is often a simple indicator of overall cooler quality. More practically speaking, a heatsink is in many ways only as effective as the contact it makes with the processor - the flatter and smoother the better. Base finish is one of the criteria that Frostytech measure in the course of evaluating heatsinks, and it involves two distinct aspects. Surface Finish is the first; this is calculated with the aid of Surface Roughness Comparator that has a cross section of common machine surface finishes and their numerical surface roughness equivalents in microinches. The second is Surface Flatness. This is tested with an engineers straight edge or proven flat surface, in two axis.

The aluminum base plate on the Akasa Revo heatsink has a fairly smooth, sanded finish with a surface roughness of ~16 microinches. According to the straight edge the base is very slightly convex in one axis and generally flat in the opposite.

Sound level measurements are coming up next on Frostytech...

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Table of Contents:

 1:  Akasa Revo AK-925 Loop Thermosyphon Heatsink Review
 2: — 360° View - Akasa Revo AK-925 Heatsink
 3:  Sound Level Measurements: Which Heatsink is Quietest?
 4:  AMD Heatsink Temperature Comparisons
 5:  Intel LGA775/1156 Heatsink Temperature Comparisons

List all Akasa heat sinks that Frostytech tested?

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