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Item#: N82E16835103181

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

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

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This product qualifies for the Iron Egg guarantee. We'll match any qualifying competitor's price.
BUY WITH CONFIDENCE
This product qualifies for the Iron Egg guarantee. We'll match any qualifying competitor's price.
BUY WITH CONFIDENCE
This product qualifies for the Iron Egg guarantee. We'll match any qualifying competitor's price.
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  • Overview
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  • Warranty & Returns
  • Reviews

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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  • Jesse W.
  • 8/26/2015 11:48:19 AM
  • Tech Level: High
  • Ownership: 1 week to 1 month
  • Verified Owner

5 out of 5 eggsCooler Master Seidon 240M LCool

This review is from: Cooler Master Seidon 240M – All-In-One CPU Liquid Water Cooling System with 240mm Radiator and 2 Fans

Pros: Works pretty good, i have an AMD FX-9590 CPU which run very hot and it does the job. It is big, very big, you will need a wide case to find room for this thing. Overall i'm very pleased with its performance, plus it was easy to install and fit great.

Cons: None really a con, very large however i knew it before i purchased the cooler.

Did you find this review helpful? Yes No

  • Stacey M.
  • 7/27/2015 4:33:41 PM
  • Tech Level: Somewhat High
  • Ownership: 1 week to 1 month
  • Verified Owner

5 out of 5 eggsSo far so good

This review is from: Cooler Master Seidon 240M – All-In-One CPU Liquid Water Cooling System with 240mm Radiator and 2 Fans

Pros: I run an i7-5820K, 3.3 GHz. Keeps it cool, works well. I'm concerned about my idle temps, they're about mid to low 40s. Highest I've seen idle is 47, lowest was about 37. I haven't stress tested but immediately after exiting a game for extensive playing it was only about 54-57 degrees Celsius.

Cons: -High idle temp (won't deduct an egg because it could have to do with my thermal paste.)

Other Thoughts: Overall, does what I need it to do and works well. I recommend it.

1 out of 1 people found this review helpful. Did you? Yes No

  • tyler s.
  • 7/24/2015 8:05:54 PM
  • Tech Level: High
  • Ownership: 1 day to 1 week
  • Verified Owner

5 out of 5 eggs1 x Cooler Master Seidon 240M

This review is from: Cooler Master Seidon 240M – All-In-One CPU Liquid Water Cooling System with 240mm Radiator and 2 Fans

Pros: was very easy to install. worked right out of the box (after hooking to the Mobo. has worked great and never hear it.

Cons: none atm

Other Thoughts: build
1 x Intel Core i7-5820K Haswell-E 6-Core 3.3GHz LGA 2011-v3 140W BX80648I75820K Desktop Processor

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

1 x ASUS X99-A/USB 3.1 LGA 2011-v3 Intel X99 SATA 6Gb/s USB 3.1 USB 3.0 ATX Intel Motherboard

2 x G.SKILL Ripjaws 4 series 16GB (4 x 4GB) 288-Pin DDR4 SDRAM DDR4 3000 (PC4 24000) Desktop Memory Model

Sli 2 x ASUS TURBO-GTX970-OC-4GD5 GeForce GTX 970 4GB 256-Bit GDDR5 PCI Express 3.0 HDCP Ready SLI Support Video Card

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  • Michael P.
  • 7/21/2015 8:37:00 AM
  • Tech Level: High
  • Ownership: 1 day to 1 week
  • Verified Owner

5 out of 5 eggsDetails

This review is from: Cooler Master Seidon 240M – All-In-One CPU Liquid Water Cooling System with 240mm Radiator and 2 Fans

Pros: Attention to detail is awesome
Very quiet
Instructions were detailed and helpful
Price/Performance was top notch

Cons: None.

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  • Yunchang K.
  • 7/17/2015 12:06:33 AM
  • Tech Level: High
  • Ownership: less than 1 day
  • Verified Owner

4 out of 5 eggsGreat cooling solution.

This review is from: Cooler Master Seidon 240M – All-In-One CPU Liquid Water Cooling System with 240mm Radiator and 2 Fans

Pros: Easy installation, great cooling solution, good build quality, the pump is pretty quiet.

Cons: Included fans are noisy.

Other Thoughts: I started looking heavily into overclocking recently. My old i5 2500 could overclock decently with the stock air cooler, but my i5 4670k was burning up at 75-80C core temps! And it could barely go past 4.4GHz. After a friend of mine told me the wonders of liquid cooling, I decided to get this kit.

Installation is a breeze and works well with the Rosewill Thor V2 case. The included fans are noisy though- they're 4 PIN fans and I think I may lower the fan speed to quiet them down.

My core temps idle at 30C and at load 45-50C which is significantly better than 75C! With the stock fan it was idling at 44C. I highly recommend this to anyone on the fence about liquid cooling.

2 out of 2 people found this review helpful. Did you? Yes No

  • Anonymous
  • 6/11/2015 9:30:24 PM
  • Tech Level: High
  • Ownership: 1 week to 1 month
  • Verified Owner

3 out of 5 eggsokay been a week now

This review is from: Cooler Master Seidon 240M – All-In-One CPU Liquid Water Cooling System with 240mm Radiator and 2 Fans

Pros: price fits cooler Master Stryker with ease only with 2 fans, though 4 fans will not fit depending on mobo I have Asus Hero now 2 slim fans will fit on top of the case not in the case. with filter removed.

Cons: I am not sure but still getting higher then normal temps, I think the pump is not working correctly seems. Seem to be the case, I am using Artic silver.
I now think at 59.99 its just not worth it.

1 out of 1 people found this review helpful. Did you? Yes No

  • jamie m.
  • 6/3/2015 8:09:59 PM
  • Tech Level: High
  • Ownership: less than 1 day
  • Verified Owner

5 out of 5 eggsNot bad

This review is from: Cooler Master Seidon 240M – All-In-One CPU Liquid Water Cooling System with 240mm Radiator and 2 Fans

Pros: So far idles at 28-32c

full load at 4.59 69-71c

The Y adapter plugs into the main 4 pin cpu fan.

Cons: The directions suck, they should include 4 fans. fits cooler master stryker with ease.

not worth 89.99 lucky it has 20 rebate.

fan wines


google videos on install. a lot of work. took 35 minutes

Other Thoughts: Network admin, fixing computers for a long time. Comptia A+, N, S, P, MCSA Server 12 R2, CFOT, and a few more certs I haven't mentioned, 10 yrs exp

0 out of 3 people found this review helpful. Did you? Yes No

  • Derek L.
  • 6/2/2015 10:37:24 AM
  • Tech Level: Somewhat High
  • Ownership: less than 1 day
  • Verified Owner

4 out of 5 eggsAlmost perfect AIO...

This review is from: Cooler Master Seidon 240M – All-In-One CPU Liquid Water Cooling System with 240mm Radiator and 2 Fans

Pros: Great performance
Easy installation
Good price


I picked this unit up on sale for $89.99 with a $20 rebate. I was a bit skeptical at first whether or not it would make a huge difference, and WOW , I can tell you this blows my old cooler out of the water.

I was using a CM hyper TX3 before because of space constraints in my case. I was actually worried I wouldn't be able to fit this AIO in my Corsair carbide Spec-3, and although it is a tight fit that requires removing my exhaust fan temporarily, it does fit. Make sure you have low profile ram and non-crazy northbridge heat sinks.

As far as the performance goes, I was getting a max of 59-62 degrees in P95 with my old cooler on an 8320 @ 4 ghz. This cooler maxes out at 39* and returns to 11* idle within 5 seconds. No, that is not an exaggeration. The 240m radiator dissipates an enormous amount of heat. I feel like I could drop my temps even further by installing some better fans, but for now these will suit me fine.

Cons: Looks dull- compared to a corsair AIO (which I was considering before I grabbed this one) the tubing is rough. Included Y-splitter does not have fully shielded wires.

Strange clicking / whirring noise. Sounds like a mix between a wheedwhacker and an outboard motor. Not very loud, but noticeable.

As this is my first AIO, I'm not yet sure if that's just how a pump sounds or if it's one of the fans. I just installed the cooler and booted up my system to check performance. I will update the review if I'm able to fix the problem.

Other Thoughts: So far I'm happy with this cooler. I will run it overnight to check for leaks but so far so good. Will update with final thoughts when I've finished my overclock.

0 out of 1 people found this review helpful. Did you? Yes No

  • Jered G.
  • 5/28/2015 7:07:12 AM
  • Tech Level: Somewhat High
  • Ownership: 1 month to 1 year
  • Verified Owner

5 out of 5 eggsFirst Liquid Cooler

This review is from: Cooler Master Seidon 240M – All-In-One CPU Liquid Water Cooling System with 240mm Radiator and 2 Fans

Pros: This review is based on an X99 motherboard.

I've built many computers over the years but haven't really had the need or want to get involved in liquid cooling because although I've over clocked my CPUs, the heatsinks/fans I've had in the past have been sufficient and the price of liquid coolers has been high. On my new X99 build I decided to see what all the fuss was about. I picked up this Cooler Master Seidon 240M and boy am I pleased.

On an X99 board, this installation is very simple and straight forward. From unpacking to clean up I believe I spend all of 30 minutes on the project. I'm not a fan of stock thermal grease so I set aside what came with the cooler and utilized Artic Silver instead. I have no way of saying that the stock grease is good or bad, but it's just my preference to use something else.

The cooler is quiet and allowed me to raise the clock of my CPU (i7 5820k) a solid 1.1Ghz and still be stable. I haven't really pushed it beyond this because as I said earlier, I don't exactly have the need, but I think I could get a couple more clicks out of it if I really tried. I have the radiator and fans mounted to the top of my case and if I put my hand above it, I can really feel the heat from the CPU being pushed out and away. Gotta love it.

This has also dropped the ambient temperature of my case by 10 degrees celsius under load and I'm seeing a temperature drop on my CPU of about 20 degrees celsius under load on average compared to my old heatsink/fan cooler.

Cons: No fancy lights to show it off! But in all seriousness, I do wish they would've included 4 fans instead of just 2. I mean... it can't cost Cooler Master more than a couple bucks to include and I would've gladly paid a little more for them. I'm just a little too lazy to make another order at this point.

Other Thoughts: Absolutely pleased with this set up. Simple, straight forward, no headaches, immediate decrease in temperature.

0 out of 1 people found this review helpful. Did you? Yes No

  • Daniel D.
  • 5/25/2015 9:31:41 PM
  • Tech Level: Somewhat High
  • Ownership: 1 day to 1 week
  • Verified Owner

5 out of 5 eggsGreat Performance Overall

This review is from: Cooler Master Seidon 240M – All-In-One CPU Liquid Water Cooling System with 240mm Radiator and 2 Fans

Pros: - Provides very cool temps to my i5 2500k, overclocked at full load around 65 - 70 degrees
- Easy to assemble due to good instructions
- Well done packaging, found no bent fins in the radiator
- Great build quality

Cons: - Fans are very loud at full RPM, which is expected of course
- Would prefer the tubing that the h100 uses for aesthetics

Other Thoughts: Fantastic cooler, no problems with it so far. The fans may be loud at full RPM but turning them down to 1400 RPM virtually makes it silent and has no affect on performance whatsoever.

0 out of 1 people found this review helpful. Did you? Yes No

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Item#: N82E16835103181
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