Cooler Master Nepton 240M Review


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Cooler Master Nepton 240M Liquid Radiator Review

By Aidan Moore

Manufacturer: Cooler Master Ltd. Inc.
Product Name: Nepton 240M
Model Number: RL-N24M-20PK-R1
UPC: 884102026744 EAN: 4719512047774
Price As Tested: $129.99 (MSRP)

Full Disclosure: The product sample used in this article has been provided by Cooler Master.

At first glance, the Cooler Master Nepton 240M looks just like any other dual 120mm cooling solution. However, take a closer look at the specifications and you realize that this product is making some substantial performance claims. With a stated typical noise floor of 11 dB(A) and four times greater surface area than the competition, the Cooler Master Nepton 240M should produce some impressive results in comparison to other popular liquid cooling systems.

In this article, Benchmark Reviews looks at the new Cooler Master Nepton 240M all-in-one water cooling system to determine if it’s performance matches the claims. We compare performance for the Nepton 240M against two other popular dual-fan liquid coolers.

Cooler Master Nepton 240M Ortho2


The Nepton 240M is a new 240mm liquid cooler and features Cooler Master’s latest Silencio series fans capable of 1.2mmH20 at only 11dB(A). Cooler Master claims the water-block has been improved with “Jet Impingement Technology”, increasing efficiency and providing a 120 liter per hour flow rate.

  • Extreme Cooling Performance
  • High Efficient 240mm Radiator
  • New Silencio 120 Fans
  • Maintenance Free
  • Durable FEP Tubing
  • Ultrafine Micro Channel


Cooler Master published specifications for the Nepton 240M are shown below:

Nepton 240M
CPU Socket Intel LGA 2011 / 1366 / 1150 / 1156 / 1155 / 775AMD Socket FM2+ / FM2 / FM1 / AM3+ / AM3 / AM2+
Pump Dimensions 75 x 69.8 x 49.1 mm ( 3 x 2.7 x 1.9 inch )
Radiator Dimensions 120 x 240 x 27 mm
Radiator Material Aluminum
Fan Dimensions 120 x 120 x 25 mm ( 4.9 x 4.9 x 1 inch )
Fan Speed 1200~2400 RPM (PWM) ± 10%
Fan Airflow 16-76 CFM ± 10%
Fan Air Pressure 0.48-4.8 mmH2O ± 10%
Fan Life Expectancy 160,000 hours
Fan Noise Level 6.5 – 27 dBA
Fan Bearing Type Rifle bearing
Fan Connector 4-Pin
Fan Rated Voltage 12 VDC
Pump Life Expectancy 70,000 hours
Pump Rated Voltage 12VDC


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  1. Andrew Lane

    Hopefully they don’t have the same bearing issue that Corsair had with their version of this unit (H100)…

    1. Aidan Moore


      Time will tell. I’m very impressed with the silence of the unit so far in a 24/7 system , so I’ll be listening for any developing rattling or squeaking.

      BTW, I ran a Corsair H100 for 3 years without developing any bearing noise. The H100 is a good unit, but it’s stock fans run very loud under load.


  2. Marco

    I have a swiftech H220 in a long RMA and I’m thinking to buy the Nepton 240M. How is the H220 vs Nepton 240M ?

    1. Aidan Moore

      Hi Marco,

      Looking at the H220 specifications, the two units appear to be similar in performance. You will notice the lower noise of the Nepton (6.5 dBA min) vs the Swiftech (16dBA min).

      And the Nepton has a 5 year warranty vs the 3 years for the Swiftech. Overall the Nepton would be a great choice. I’ve been using it 24/7 with no issues.

      Good luck!

      1. Marco

        Hi Aidan,

        thanks for your prompt reply. The new Silencio fan do a great job! What about the pump ? Is it silent ?

        1. Marco


          1. Aidan Moore

            Hi Marco,

            Yes. The pump is inaudible even with the case open. All in all it’s a very quiet closed loop cooling system.


  3. marco

    Hi Aidan
    Thanks for info.

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