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Item#: N82E16835103181

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

  • 600~2400 RPM (PWM) +/- 10% 19.17 ~ 86.15 CFM +/- 10%
  • Radiator Dim. 273 x 120 x 27 mm (10.7 x 4.7 x 1.1 inch)
  • Fan Dim. 120 x 120 x 25 mm (4.7 x 4.7 x 1 in)
  • Fan Noise 19 ~ 40 dBA
BUY WITH CONFIDENCE
This product qualifies for the Iron Egg guarantee. We'll match any qualifying competitor's price.
IronEgg
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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Learn more about the Cooler Master RL-S24M-24PK-R1

Quick Info

Warranty

  • Limited Warranty period (parts): 2 years
  • Limited Warranty period (labor): 2 years


Customer Reviews of the Cooler Master RL-S24M-24PK-R1

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  • 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.

Did you find this review helpful? 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.

Did you find this review helpful? Yes No

  • Mark C.
  • 5/1/2015 12:56:34 PM
  • Tech Level: Somewhat High
  • Ownership: more than 1 year
  • Verified Owner

3 out of 5 eggsGreat but didn't last

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

Pros: Silent operation. Great cooling capabilities.

Cons: Pump died after 1.5 years.

Other Thoughts: I used this cooler on an AMD 6800K. It was probably overkill but I wanted to utilize the radiator area on the N400 case. It kept the system very cool and I enjoyed the near silence. However, the pump died this morning and CPU shut the system down. I was forced to install the stock heatsink/fan which was kept new in the box. I've forgotten the crazy sound a heatsink and fan make over the time I owned this cooler. I will RMA this baby and see how long the replacement lasts. Thanks for the 2 year warranty!!

Did you find this review helpful? Yes No

  • Benjamin S.
  • 4/13/2015 10:34:08 AM
  • Tech Level: High
  • Ownership: 1 month to 1 year
  • Verified Owner

5 out of 5 eggsGreat and trouble-free

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

Pros: As another reviewer noted: the Seidon 240M fits perfectly under the top case fan in the Cooler Master HAF 932 Advanced case. Just ran the mount screws down around the case fan to the radiator (now beneath the case fan) and locked it in, then mounted the radiator fans underneath it in a push/pull with the case fan. Lots of room up in the top of the case.

Cons: None yet. I only wonder when the coolant will no longer be any good.

Other Thoughts: Definitely do some research into measurements and what case you will use. A cooler this size, you want to make sure you have the space to accommodate it.

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

  • Jose Z.
  • 4/3/2015 6:42:31 PM
  • Tech Level: Average
  • Ownership: more than 1 year

5 out of 5 eggsPretty Solid

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

Pros: Never tried the stock fans. Immediately upgraded to some Corsair 2350 RPM fans and this thing has been running like a beast for over a year and half now. Running on a 4770k at 3.8ghz and idles at exactly the room's temp with fans running at 800rpm. Temps max out at about 65C under full load at 3.8ghz. Occasionally overclock to 4.4ghz and temps still max at around 75C under full load. No problems with this systems thus far.

Cons: Pretty big radiator

Other Thoughts: Don't know how this does with the stock fans, but everything else does exactly what its supposed to do pretty well.

Did you find this review helpful? Yes No

  • Jose F.
  • 3/25/2015 8:44:14 AM
  • Tech Level: Average
  • Ownership: 1 day to 1 week
  • Verified Owner

3 out of 5 eggsFirst time with this Cooling System

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

Pros: CPU temp 39c Installation of block was very easy. AM3+ Radiator had no bent fins. Quiet currently only using one fan

Cons: Both Fans do work but when I tighten one of them down the side walls of the fan came in and the blades are scraping the inside of the housing. My intent is to replace the fans

Other Thoughts: OS: ESXI 6.0
Board : ASUS Sabertooth r2.0
Ram : Vengance 24 gig 1600
Proc: FX 8320
Video: ASUS R7250X-2GD5 Radeon R7 250X 2GB Passthrough for steam stream
HD: 2 WDBLACK 2tb, 6 WD RED 3tb

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

  • Jacob G.
  • 3/17/2015 12:33:38 PM
  • Tech Level: Somewhat High
  • Ownership: 1 month to 1 year

5 out of 5 eggsGreat cooler

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

Pros: Very easy to install on my Corsair C70 case, Came with solid brackets for mounting (gigabyte 970A-UD3P / fx-6300), keeps cool: Idle is 15-18c and max 42c @ 4.9GHz , blue light isn't too intrusive.

Cons: My only con, and I debated about docking and egg or not, is that it can be a little rough to get the spring loaded screws started. I was a little paranoid that I was going to severely bend or even break my board.

Other Thoughts: I know it might be bit excessive for a FX-6300, but I plan on switching up later on.

Did you find this review helpful? Yes No

  • Patrick O.
  • 3/11/2015 11:48:25 AM
  • Tech Level: High
  • Ownership: 1 day to 1 week
  • Verified Owner

1 out of 5 eggsWon't trust cooler master for any water cooling

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

Pros: None

Cons: Leaked within the first 7 minutes
Super loud

Other Thoughts: Had to remove my noctua NH-D15 because of the new case I bought (nzxt s340 ), so I thought I would try this out instead of Corsair. I know it at least took out my motherboard (msi z97 gaming 7) not sure if my 970 made it out alive because I have no way of testing anything (good thing I didn't install my evga kingpin 980). This sealed the deal for me with cooler master I will never buy anymore products from them in the future and I build 4-7 computers a year for the past 16 years. Good thing MSI said they would replace motherboard for 45.00 since it was due to water leak. My complete system was 1 month old.

Manufacturer Response:

Hello Patrick O,

We apologize for the trouble that you are experiencing with the Seidon 240m. The Seidon 240m does have a 2 year warrany so please contact us for a replacement.

Please let me know if you have any more questions.

Phone: 888-624-5099

Respectfully,
Patrick
CMUSA Support

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

  • Dan L.
  • 3/7/2015 10:13:58 PM
  • Tech Level: Average
  • Ownership: less than 1 day

4 out of 5 eggsInstructions are 80%

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

Pros: Keeps Q9650 (LGA 775) overclocked to 4.2GHz under 60C at full load. Fits well in HAF 932 (actually room to spare).

Cons: Missing instructions for how to assemble the fans to the radiator. Granted you can figure this out, but they include a rubber gasket that looks like it's supposed to go between the fans and the radiator, and say nothing about it in the instructions. Also make sure you use the right screws -- some look the same but are a bit longer / shorter. Use the shorter ones when assembling 2 fans.

Other Thoughts: 2009 build that used to have a liquid cooler but sprang a leak, so I put the stock CPU heatsink / fan on it a few years ago and set to stock speed. While cleaning my machine today, I removed the Q9650 stock heatsink / fan and broke its mounting tabs, so had to run out and buy something. Went with this because of the price. After installing I reconfigured previous overclock to 4.2GHz, ran some tests, and the CPU is staying nice and cool. I had plenty of room to spare, but this is a rather large chassis (HAF 932).

Did you find this review helpful? Yes No

  • marc d.
  • 2/27/2015 7:55:34 AM
  • Tech Level: Average
  • Ownership: 1 month to 1 year
  • Verified Owner

5 out of 5 eggscool master 240m

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

Pros: Great product
re-rooted on top of cpu out of bay!
easy install
cool efficient at high clocking...
hey superbe pruduct a great price and mail in rebate. thanks.

Cons: the fans are loud like very loud
1week later the first on started to get noisy then a month later the other one so i got 2 cougars to do the job

Did you find this review helpful? Yes No

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Item#: N82E16835103181
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