Cooler Master Seidon 240M review

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The Seidon 240M is Cooler Master’s latest addition to its compact watercooling kit line that aims to bring watercooling to the masses. It fits in many cases that support 2 x 120mm fan radiators, is compatible with pretty much any available Intel and AMD platform whilst being as easy to install as say a traditional heatsink. It comes factory filled, sealed and tested with a two year zero maintenance guarantee. The kit comes with two 120mm PWM fans that have a fairly wide RPM range, Seidon can operate silently or unleash more power as desired.

The water pump helps dissipate heat effectively and maintain temperatures through stable water circulation. The UltraFine Micro channels on the waterblock enlarge the contact surface between cold plate and coolant for more heat transfer. The performance 240mm radiator is designed to dissipate huge heat from overclocked CPU and can accommodate two 120mm PWM fans. The 120mm PWM fan offers a wide RPM range of 600~2400 +/- 10% allowing you to fine tune and balance fan noise and performance.


  • Factory filled with coolant, then sealed and pressure tested - requires zero maintenance for years.
  • Waterblock made with UltraFine Micro Channels to enlarge the contact surface between cold plate and coolant.
  • Durable and powerful water pump – dissipates heat effectively and maintains temperatures through stable water circulation.
  • Performance 240mm radiator is designed for handling high wattage overclocked CPU.
  • Double 120mm PWM fans with a wide RPM range to fine tune and balance fan noise and performance.
Model RL-S24M-24PK-R1
CPU Socket Intel LGA 2011 / 1366 / 1156 / 1155 / 1150 / 775
AMD Socket FM2 / FM1 / AM3+ / AM3 / AM2+ / AM2
Pump Dimensions ø 70 x 27mm (ø 2.75 x 1.1 inch)
Radiator Dimensions 273 x 120 x 27 mm (10.7 x 4.7 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
Fan Bearing Type Rifle bearing
Fan Connector 4-Pin
Fan Rated Voltage 12 VDC
Fan Rated Current 0.2 A
Fan Power Consumption 3.6 W
Pump Life Expectancy 70,000 hrs
Pump Noise Level <25 dBA
Pump Rated Voltage 12 VDC
Pump Load Current 0.15 A
Pump Power Consumption 1.8W
Warranty 2 years

The Seidon 120XL and 240M are compatible with every CPU from Intel and Advanced Micro Devices and that even includes socket LGA 2011 and/or FM2. Heck, even the older Socket 775 is listed to be compatible. The Cooler Master Seidon 240M features universal socket support including Intel LGA2011, 1366, 1156, 1155 and LGA775 as well as AMD FM2, FM1, AM3+, AM3, AM2+, and AM2. 

A quick search shows prices of roughly 85 USD and even 70 USD after a rebate (!). But let's have a look at the product in more detail.


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