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Best CPU Cooler Performance - Q3 2008 E-mail
Reviews - Featured Reviews: Cooling
Written by Olin Coles   
Thursday, 09 October 2008
Table of Contents: Page Index
Best CPU Cooler Performance - Q3 2008
Thermally Conductive Element Reference
Cooler Master Geminii S
Cooler Master V8
Coolink Silentator
Evercool Transformer 6
OCZ Gladiator Max
Thermaltake V14 Pro
Vantec AeroFlow FX 120
Xigmatek Apache EP-CD901
Xigmatek HDT-S1284
Zalman CNPS9300 AT
Zaward Gyre ZCJ010
TIM Application and Surface
Testing Methodology
Test Results: Stock Cooling Fan
Test Results: High-Output Fan
CPU Cooler Final Thoughts
Best of Q3 2008 Conclusion

Cooler Master Geminii S

Cooler Master has been a longtime supporter of fashionable cooling. While I must admit that they do a pretty good job of capturing my attention with looks, but there have been times that I question the engineering. The Cooler Master Geminii S cooler is built to cool mildly overclocked systems with the least of fan noise.

Cooler Master has adopted a proprietary mounting system for their after-market cooling solutions, and the Geminii S (RR-CCH-PBJ1-GP) follows suit. This mounting system requires motherboard removal, but the upside is that Intel's standard clip system is replaced with a screw and nut bolt-down kit.


A copper base enables a smooth transfer of heat energy to five copper heat-pipes which span across a 120mm aluminum-fin cooling surface. Cooler Master has not yet adopted the Heat-pipe Direct Touch (HDT) technology, and has relied heavily on a well-polished contact surface soldiered to many heat-pipes. The highly polished copper surface requires barely a smear of thermal interface material to mate the two contact surfaces, which does very well with lapped and polished processors.

Once installed the Geminii S can operate with either the included 120mm cooling fan, or the four corner screws can be removed to replace the stock fan with an after-market option. For this article, Benchmark Reviews tests the Cooler Master Geminii S cooler with both the included 120mm fan and a high-output Yate Loon D12SH-12 cooling fan.

As of October 2008 the Cooler Master GeminII S CPU Cooler is listed at NewEgg for $35.99, however several other retailers are also available for price comparison.


RR-CCH-PBJ1-GP Specifications

  • Dimensions: 124 x 120.8 x 75 mm
  • Weight: 560 g
  • Heat Sink Dimensions: 124 x 118.4 x 62 mm
  • Heat Sink Material: Copper base/ 5 heatpipes/Aluminum fin
  • Heat Pipes Dimensions: Φ6 mm
  • Fan Dimension (W / H / D): 120 x 120 x 25 mm
  • Fan Speed: 1000~2000 R.P.M.
  • Fan Airflow: 69.69CFM
  • Fan Air Pressure: 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


About the company: Cooler Master

Cooler Master was founded with the mission of providing the industry's best thermal solutions. Since its establishment a decade ago, the company has remained faithful to this mission, emerging as a world leader in products and services for companies dealing with devices where heat issues must be resolved.

In pursuing this mission, Cooler Master is absolutely committed to delivering solutions that precisely meet customer requirements for features, performance, and quality. Moreover, we strive to be a reliable long-term partner for our customers that they can truly depend on. It aims to be the first and foremost name that comes to mind for companies around the world seeking thermal solutions, and seeks to build such a reputation through outstanding technology, sophisticated design, and superior service.

Cooler Master's current business encompasses a comprehensive lineup of thermal solutions for a full range of applications. Its products range from heat sinks and fans to component housing, chassis, and ducting for computers, industrial machinery, telecommunications equipment, and many other devices.


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