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Universal Design: compatible with Intel Core 2 Quad, Core 2 Extreme and Core 2 Duo and AMD Athlon 64 FX and Athlon 64 X2 Duo core

Board and CPU Cooler Design: cools CPU and its surrounding components (motherboard, memory, VRM, chipset and etc.)

Superior Cooling Performance: copper base, 5 heat pipes and high density aluminum fin

Unique Fan Bracket: for mouting one 120mm fan/two 90mm fans/two 80mm fans

Silent Operation: at only 19 dBA

Pure Copper Base
Pure copper base maximizes heat transfer quickly
Silent 120mm Fan
Sickle blade design produces huge airflow and decreases noise
5 Heat Pipes / High Density Fins
5 heat pipes transfer heat to the fins efficiently

High density fins creates excellent heat dissipation

Special Features
CPU and Board Cooler
The default silent fan (120x120x25mm) can be easily exchanged to two 92mm/80mm fans for complete cooling solution. It draws cool air to cool CPU and its surrounding components (memory, VRM, chipset and etc.)
Flexible Fan Bracket Design
Flexible mechanical design supports single 120mm fan or two 92mm/80mm fans. And the adjustable bracket is movable to avoid any interference

**80mm and 92mm fans are optional
CPU Socket Intel Socket : LGA775, LGA 1156 (2009 onward), LGA 1366 (2009 onward)

AMD Socket : AM3 / AM2+ / AM2
CPU Support Intel :
Core i7, Core 2 Extreme, Core 2 Quad, Core 2 Duo, Pentium Extreme, Pentium Dual-Core, Pentium D, Pentium 4, Celeron Dual-Core, Celeron D, Celeron

Phenom, Athlon 64 FX, Athlon 64 X2, Athlon X2, Sempron
Dimension 4.88" x 4.76" x 2.95"
Weight 1.2 lbs
Heat Sink Dimensions 4.88" x 4.66" x 2.44"
Heat Sink Material Copper base/ 5 heatpipes/Aluminum fin
Heat Pipes Dimensions 6 mm
Fan Dimension (W / H / D) 4.72" x 4.72" x 0.98"
Fan Speed 1000~2000 R.P.M.
Fan Airflow 69.69CFM
Air pressure (mmH2O) 2.94 mmH2O
Bearing Type Long life sleeve
Fan Life Expectancy 40,000 hours
Fan Noise Level (dB-A) 17~21 dBA
Connector 4-pin ( PWM Mode)
Fan Speed Adjustment PWM
Rated Voltage 12 V
Start Voltage 7 V
Operating Voltage 10.8~13.2 V
Rated Current 0.35 A
Input Power 4.2 W
Notice Supplied accessories may differ by country or area. Please check with your local distributor for further details.
Disclaimer: Images are for informative purposes only; displayed parts and accessories may not be included in the actual product package.

Click a thumbnail below to view a larger image. : September 2009

"The Geminii S performed fairly well, keeping pace with the Shuriken and LOW-7000 until fan speeds were decreased drastically. It's affordable, has a good solid mounting system and ships with a surprisingly good fan with excellent acoustics. If you have enough space to accommodate the Geminii S, it is a worthwhile investment."

» Details

OCIA - Approved : October 2008

This CPU cooler has a lot going for it. Starting with pure aesthetics, this is one nice looking unit with a unique design. Four separate banks of cooling fins are sandwiched by a 120mm fan, all of which are connected to the base of the heatsink via eight different heat pipes. Cooler Master integrated a rheostat-style fan speed controller, accessible by using the included add-in card slot. All of the necessary hardware is included for installation as well as a tube of thermal paste.

» Details

Thinkcomputers: 8/10

Thinkcomputers: Good Value : September 2008

The Cooler Master GeminII S isn't exactly perfect but I think disregarding the minor problems of this cooler the GeminII S is a great value. There are many places online to buy this cooler, all of which price for about $35. Considering that this is one of the better CPU coolers we've reviewed when it comes to cooling temperatures I have to say this is a Good Value. ThinkComputers awards the Cooler Master GeminII S CPU + Board Cooler an 8 out of 10 score and our Good Value Award.

» Details : August 2008

Apart from the laborious process of getting this cooler installed; testing this CPU cooler was an extremely fun and rewarding process. I used an AMD Opteron 1214, a processor known for putting out quite a bit of heat while under load. The CoolerMaster GeminII S lived up to the marketing hype and the legacy of the other CoolerMaster products. Using the default thermal compound the GeminII S kept my fully loaded processor within 4.7 Celsius of the ambient tempterature while fully loaded. The Stock OEM cooler was only able to maintain a 12.2 Celsius differential making the GeminII S around 60% more efficient.

Overall, I was very impressed by the performance and construction of this product. My board and configuration does not support overclocking, but I would expect that if one were to try this cooler out in an overclocking situation that it would easily allow a 300-800Mhz overclock on just air cooling. These numbers depend of course on many other factors but are a good guess based on the temperatures that I was able to maintain with this cooler. At an average selling price of around $40, the CoolerMaster GeminII S would make a welcome addition to your already hot rig.

» Details : July 2008

“Overall the Coolermaster GeminII S is a very good heatsink for both Intel and AMD platforms when running at full fan speed, particularly if we consider its compact height…bottom line, the Coolermaster GeminII S is a good thermal option hampered by cumbersome mounting system.”

» Details


Name Type Release Date Description
GeminII S Manual 2008.08.26 Manual for GeminII S CPU cooler
GeminII S Product Sheet 2008.08.19 Product sheet for GeminII S CPU cooler


Item | Question
1.   If I add another fan on my Geminii S in CM Stacker 830, will it block the side panel close?

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