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Cooler Master Seidon 120M CPU Liquid Cooling System 120mm 775/1150/1155/1156/1366/2011 AM2/3/3+/FM1

This product can only be exchanged or replaced with the exact same item.
Cooler Master Seidon 120M CPU Liquid Cooling System 120mm 775/1150/1155/1156/1366/2011 AM2/3/3+/FM1 - 1
Actual product may not be exactly as shown.
Cooler Master Seidon 120M CPU Liquid Cooling System 120mm 775/1150/1155/1156/1366/2011 AM2/3/3+/FM1 - 78045_l.jpg Cooler Master Seidon 120M CPU Liquid Cooling System 120mm 775/1150/1155/1156/1366/2011 AM2/3/3+/FM1 - 78045_1.jpg Cooler Master Seidon 120M CPU Liquid Cooling System 120mm 775/1150/1155/1156/1366/2011 AM2/3/3+/FM1 - 78045_2.jpg Customer Photos (0)
Reg. Price: $101.83  CAD
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   Shipping Weight:   3 lbs
   Part #: RL-S12M-24PK-R2
 May We Also Suggest

Features    [ Edit | History ]
  • Factory filled with coolant, then sealed and pressure tested - requires zero maintenance for years.
  • Compact and durable all in one waterblock secured with 12 stainless steel bolts.
  • Waterblock machined out of a single block of copper for the best possible heat transfer.
  • Precision machined Micro Channels maximize the water contact surface to quickly dissipate heat.
  • Compact 120mm aluminum radiator fits in virtually any case, internal or external.
  • Fin design optimized for minimum air restriction to reduce fan speed and noise.
  • 120mm PWM fan with a wide RPM range to fine tune and balance fan noise and performance.
  • Blue LED indicator lights up when operating.


Performance Comparison:

Specifications    [ Edit | History ]
Model RL-S12M-24PK-R1
CPU Socket Intel LGA 2011 / 1366 / 1156 / 1155 / 775
AMD Socket FM1 / AM3+ / AM3 / AM2
Dimension ø 70 x 27mm (ø 2.75 x 1.1 inch)
Radiator Dimensions 150.3 x 118 x 27mm (5.9 x 4.6 x 1.1 inch)
Radiator Material Aluminum
Fan Dimension 120 x 120 x 25 mm (4.7 x 4.7 x 1 in)
Fan Speed 600~2400 RPM (PWM) ± 10%
Fan Airflow 19.17 ~ 86.15 CFM ± 10%
Fan Air Pressure 0.31 ~ 4.16 mm H2O ± 10%
Fan Life Expectancy 40,000 hours
Fan Noise Level (dB-A) 19 ~ 40 dBA
Bearing Type Rifle bearing
Connector 4-Pin
Fan Rated Voltage 12 VDC
Fan Rated Current 0.3A
Power Consumption 3.6W
Pump Life Expectancy 70,000 hrs
Pump Noise 17dBA
Pump Rated Voltage 12 VDC
Pump Power 1.8W

COOLERMASTER RL-S12M-24PK-R2 Customer Reviews

Product reviews on are screened for relevance and inappropriate content. Reviews may contain inaccurate information about the product. If there is a discrepancy, please use the Flag this Review link located beside each review. Reviews are not an endorsement expressed by, but opinions from customers based on their own experience with a product. We do not recommend you make purchasing decisions based on facts or opinions expressed regarding COOLERMASTER RL-S12M-24PK-R2 reviews.
Experience: 3 Months
Good value - Keeps CPU reasonably cool
Loud - Could perform better
The Cooler Master Seidon 120M closed loop liquid CPU cooler is a pretty good CPU cooler for the money but is quite loud. When you first get this cooler, you may hear a bit of a rattling for the first few weeks. It keeps my CPU cool enough, although I'd like it to perform a bit better.

Experience: 1 Months
 Verified Owner
Cheap AIO
Low Profile
Better Then Most Air Coolers
Pump is quiet
Hoses are stiff
I had a Coolermaster GeminII S524 in an HTPC case(NMEDIA 5000b) and with a Phenom II 955 overclocked to 4.0GHZ I would often reach or exceed the 62 degree max temp under heavy load.
I bought this cooler to reduce noise and lower temperature. I drilled 4 holes on top of the case so I could mount screws through the perforated 120mm hole. I am now seeing temperatures reaching a max of 51-53 degrees and a reduction in noise. This is also still using a single fan, so performance could be further increases using another Coolermaster PWM fan. There is zero pump noise on this unit, if you are getting noise with this I would advise to send it back.

Experience: 60 Days
great bang for the buck
very good perfomance for single fan rad

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Messages about Cooler Master Seidon 120M CPU Liquid Cooling System 120mm 775/1150/1155/1156/1366/2011 AM2/3/3+/FM1

Would this fit in my Shuttle z77? (Young_S- Jun 19, 13, 1 Replies) Read this message

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Reviews from the Web

Below are reviews found on other web sites for this product submitted by customers.

Comment: great review
Posted by: ross_w @05/04/13
Posted by: werty316 @02/17/13
Submit a review link   |   Latest 30 reviews
Product Warranty
First 30 days limited warranty through The remainder of the one year warranty is provided directly by the manufacturer.

Support For USA, Canada, & Mexico 
Cooler Master USA, Inc.
Unit A - 1951 S Parco Ave.
Ontario, CA

Phone: 1-909-673-9880
Fax:  1-909-673-9882 or 9883

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