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Cooler Master GeminII S Heatsink Review
Cooler Master GeminII S Heatsink Review
Abstract: Cooler master's GeminII S heatsink stands just 88mm tall and ships with a 120mm fan mounted to its frame. An extra set of brackets allow that fan to be replaced with two 92mm or 80mm fans.

 Manufacturer  Category  Published  Author 
CoolerMaster   Cooling / Heatsinks   Jul 21, 2008   Max Page  

Home > Reviews > Page: 360° View - Coolermaster GeminII S Heatsink

360° View - Coolermaster GeminII S Heatsink

Information on Frostytech's test methodology is available here.

The 9-bladed 120x120x25mm PWM fan on the GeminII S spins at 1000-1800RPM. With it removed, the frame for attaching a special bracket allowing two 92mm or 80mm fans to be used on the Coolermaster GeminII S is visible. Note how the widely spaced aluminum fins over the base of the GeminII S go all the way down and contact the copper CPU base plate below.

The Coolermaster GeminII S heatsink is not very tall, just 88mm in height. There is 37mm of clearance on one side for things like memory slots, and with the extender bracket two fans can be mounted so one partially overhangs the DIMM slots. The nickel plated aluminum fins are 0.3mm thick and spaced 1.5mm apart. A section of fins 35mm wide is soldered to the 6mm thick copper base of the heatsink directly.

The copper base of the Coolermaster GeminII S heatsink measures 37.5x38mm in size, and is machined perfectly flat. Five 6mm diameter copper heatpipes are sandwiched between the 6mm thick copper base plate and aluminum fins above. The heatpipes fan out from the base evenly over the entire 120mm width of the heatsinks' fins.

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 Coolermaster GeminII S heatsink has a machined copper base with a surface roughness of approximately ~8 microinches. The base is 37.5x38mm in size, and about 6mm thick on average. The copper surface is smooth and perfectly flat in both axis. The four screw holes are for attaching the CPU mounting brackets.

Next, let's see how this heatsink handles the heat compared to a selection of the best AMD, and then Intel heatsinks!

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Table of Contents:

 1:  Cooler Master GeminII S Heatsink Review
 2: — 360° View - Coolermaster GeminII S Heatsink
 3:  Acoustic Sample and Heatsink Sound Levels
 4:  AMD K8 Heatsink Temperature Comparisons
 5:  Intel LGA775 Heatsink Temperature Comparisons

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