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Item#: N82E16835103181

Cooler Master Seidon 240M - All-In-One CPU Liquid Water Cooling System with 240mm Radiator and 2 Fans

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  • Zero Maintenance design
  • Durable and Powerful Water Pump
  • Waterflow FEP Tubing
  • Dual 120mm Fans (High Air Pressure, Low Noise Output)

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  • Overview
  • Specifications
  • Warranty & Returns
  • Reviews

Following the success of the Seidon 120M, COOLER Master introduces an improved CPU water cooler Seidon 240M. It has all the cooling technologies of Seidon 120M applied and has larger radiator up to 240mm. The larger radiator not only sheds more heat but also supports two 120mm fans. The compact design brings it to the masses. Also, the Seidon 240M is designed with zero maintenance and universal CPU socket compatibility.

  • newegg Fantastic cooling performance The durable and powerful 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. 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.
  • newegg Zero maintenance Factory filled with coolant, then sealed and pressure tested, the COOLER MASTER Seidon 240M requires zero maintenance for years.
  • newegg Universal Socket Compatibility 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.

Learn more about the Cooler Master RL-S24M-24PK-R2

Warranty, Returns, And Additional Information
  • Warranty
  • Limited Warranty period (parts): 2 years
  • Limited Warranty period (labor): 2 years
  • Read full details

Customer Reviews of the Cooler Master RL-S24M-24PK-R2

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  • Anonymous
  • 2/7/2016 9:47:42 AM
  • Ownership: 1 month to 1 year
  • Verified Owner

5 out of 5 eggsGood Cooler

Pros: No problems
Keeps the CPU really cool

Cons: Kind of loud

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  • Jonathan D.
  • 1/25/2016 1:44:18 PM
  • Ownership: 1 month to 1 year
  • Verified Owner

1 out of 5 eggsFirst liquid cool

Pros: Good and cool easy install

Cons: -Bought 9-21-15 and as of right now I am on my laptop and I have greenish colored coolant from the cooler all over my graphics card. Luckily I noticed my fan speeds were going higher than normal so HOPEFULLY nothing in my system is fragged. Starting the process to attempt to get this fixed or resolved will update as process continues. NOT HAPPY AT ALL with quality as it is LEAKING all over my gpahics card and motherboard. Would give 0 eggs but it wont let me.

Other Thoughts: UPDATE If customer service and a quality product is what you are looking for do not buy from Cooler Master. 11 Days after they notified me they received the defective product I finally called them. They inform me they do NOT have any coolers to send me and want to refund my money. When asked why they hadn't contacted me they gave me the old "we were just calling" line. Basically I feel they lied 2 times at least in this one call. To say you have NO cooler products and then they were "just getting to calling me". IMO They had me waste my 15 bucks shipping it to them and decided its better business to just refund than to pay to ship me a new product. Needless to say I will NEVER buy another cooler master product and suggest heavily the same to my friends. From shipping time to them until now has been almost 3 weeks and now I have to find and order a new cooler pay shipping on that also and the time it takes to get it here. So not only will my computer be down for total about a MONTH it will actually cost me prob an extra 30 bucks in just shipping alone due to their low quality product and what they call "customer service".

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  • Christian H.
  • 1/14/2016 1:43:53 PM
  • Ownership: 1 week to 1 month
  • Verified Owner

5 out of 5 eggsGreat Value, cool & quiet.

Pros: -Easy installation
-Extremely quiet operation
-Excellent cooling, my i5-6600k idles around 15c and 28c while gaming

Cons: -Hoses are a little stiff, just consider where you're going to mount the rad and which way it will be facing before bolting things in place as you may need to flip it around to get the hoses to good place.
-Mine came with a couple of the fins bent slightly on the radiator, didn't imagine it would affect the cooling very much so it wasn't worth trying to RMA the product. So far the cooling doesn't seem to be impacted.

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  • marco r.
  • 12/29/2015 9:48:16 PM
  • Ownership: 1 month to 1 year
  • Verified Owner

5 out of 5 eggsGreat Product

Pros: Easy to install, no need to worry about checking the water lvl (at least for a couple of years). It also gives it a nice look inside my computer case.

Cons: I can't find any real answer on how long these type of AIO coolers go for before needing replacement or refill.

Other Thoughts: AIO water coolers are nice for first timers who want to dip their toes into water cooling. I expect this cooler to last me at least a few years so I'll be saving to buy a real custom water cooling kit.

Did you find this review helpful? Yes No

  • kane s.
  • 12/13/2015 8:51:36 AM
  • Ownership: 1 day to 1 week
  • Verified Owner

5 out of 5 eggsGreat Cooler

Pros: Install is a breeze and keeps your cpu ice cold.

Cons: The mounting screws for the radiator are too short. Not enough to knock an egg off over, but it should be really nice if they were longer to ensure a truly proper mount.

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  • jose l.
  • 12/3/2015 9:20:34 AM
  • Ownership: 1 month to 1 year
  • Verified Owner

2 out of 5 eggsissue

Pros: it's small for a small type case

Cons: the main issue is that the pump stop working in few months my die few days ago don't buy it

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  • Anonymous
  • 12/2/2015 1:19:03 PM
  • Ownership: 1 month to 1 year

5 out of 5 eggsPrice for performance

Pros: Nearly silent
Great price
Great cooling

Cons: none so far

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  • Anonymous
  • 11/24/2015 7:40:52 AM
  • Ownership: 1 week to 1 month
  • Verified Owner

1 out of 5 eggsBad Pump and Dented radiator

Pros: Looks good, easy installation.

Cons: Bought this cpu cooler a few weeks ago. Installation was easy enough but the mounting screws did not come in the package. As of last week I started to use it. Under heavy use the pump started clicking and died in 2 days.

Manufacturer Response:

We apologize for the trouble you are having with the Seidon 240M

Please contact us through CM Fanzone so we can get you a replacement.

Respectfully,
Nichole
CMUSA Support

Did you find this review helpful? Yes No

  • Ursus U.
  • 11/12/2015 3:38:34 PM
  • Ownership: 1 month to 1 year
  • Verified Owner

5 out of 5 eggsMy PC is at idle temps all the time

Pros: This keeps my processor at just above room temperature all the time. When I stress the processor the temps go up to around 40 at the max and then they immediately go down back to idle temps. Can't get any better than that.

Cons: The fans are loud when they're at more than 75%. I set my fan curve so they only get here under stress. They're not loud enough to hear while wearing head phones though

Other Thoughts: No fancy software to get in the way. I like to control it from the bios and it just works. This model is cheaper than some competitors but there isn't any room for an all in one cpu cooler to be better than this. I might replace the fans to be quieter one day when I get more into gaming. Until then, this product fits my needs perfectly as is.

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  • Anonymous
  • 11/5/2015 10:42:57 AM
  • Ownership: 1 week to 1 month
  • Verified Owner

5 out of 5 eggsExcellent cooler for i7-4790K 4 GHz

Pros: This cooler installed easily and does its job. It keeps my i7-4790K 4 GHz (88 TDP) processor around 43 degrees Celsius during full load and around 35 when the PC is idle. Well within normal operating temps.

Cons: None.

Other Thoughts: I would not hesitate to purchase this in the future for my next build.

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Cooler Master > 
Item#: N82E16835103181
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