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

384 customer reviews
| 48 answered questions

Price: $116.75 & FREE Shipping
Only 3 left in stock.
Ships from and sold by OutletPC.
240 x 27 mm Radiator/2 Fans
  • Pre-filled with coolant at the factory then sealed and pressure tested, allowing a two year zero maintenance guarantee
  • Waterblock made with ultrafine micro channel 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
  • High performance 240mm radiator designed to handle high wattage overclocked CPUs
  • Double 120mm PWM fans with wide RPM ranges to fine tune and balance fan noise and performance
  • Compatible CPU Sockets - Intel LGA 2011, 1366, 1156, 1155, 1150, 775 and AMD FM1, FM2, AM3+, AM3, AM2+, AM2
17 new from $98.84

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Frequently Bought Together

Cooler Master Seidon 240M - PC CPU Liquid Water Cooling System, All-In-One Kit with 240mm Radiator and 2 Fans + Arctic Silver 5 High-Density Polysynthetic Silver Thermal Compound, 3.5 Grams + Intel Core BX80646I74790K i7-4790K Processor (8M Cache, up to 4.40 GHz)
Price for all three: $463.69

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Style: 240 x 27 mm Radiator/2 Fans
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Product Description

Style: 240 x 27 mm Radiator/2 Fans

Product Description

The Seidon 240M is Cooler Master's latest, incredibly compact water cooling kit that aims to bring water cooling to the masses. It comes factory filled, sealed, and tested with a two year zero maintenance guarantee. The high performance 240mm radiator was designed to dissipate extreme heat from overclocked CPUs. Thanks to two 120mm PWM fans with wide RPM ranges, Seidon can operate silently, or unleash a powerful cooling storm at your command.

Amazon.com

Cooler Master Seidon 240M - Liquid CPU Water Cooling Kit with Pre-filled Coolant and Copper Heatsink

The Seidon 240M is Cooler Master's latest addition to its incredibly compact liquid CPU 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 every available Intel and AMD platform, and is as easy to install as a traditional heatsink. It comes factory filled with liquid, sealed and tested with a two year zero maintenance guarantee. Thanks to two 120mm PWM fans with a wide RPM range, Seidon can operate silently or unleash a powerful cooling storm at your command.

UNIQUE FULL COPPER WATERBLOCK DESIGN
Utilizes a micro-channel design to maximize surface contact area to quickly pull heat away from your processor.
SAFE OPERATION INDICATOR LED
A reassuring blue LED indicator light shines brightly when the pump is powered and running properly.
UNIVERSAL MOUNTING SOLUTION
Supports the latest sockets from Intel and AMD.
MAINTENANCE-FREE SETUP
Guaranteed for maintenance-free operation for years to come without the need to refill coolant.

Additional Information

  • CPU Liquid Watercooling Kit
  • Supports the latest sockets from Intel and AMD:
  • Intel LGA 2011 / 1366 / 1156 / 1155 / 1150 / 775
  • AMD Socket FM2 / FM1 / AM3+ / AM3 / AM2+ / AM2

What's Included

  • Seidon 240M Liquid CPU Watercooling Kit
  • Universal Mounting Kit
  • Thermal Paste Syringe
  • User Guide

Seidon Series Comparison

This Model
Seidon 120M Seidon 120XL Seidon 240M
Included Fans (120mm) 1 2 2
Maximum Supported Fans (120mm) 2 2 4
Heatsink Base Material Copper Copper Copper
Radiator Material Aluminum Aluminum Aluminum
Radiator Dimensions (No Fans) 150.3 x 118 x 27mm 150 x 120 x 38 mm 273 x 120 x 27 mm
Radiator Dimensions
(Included Fans Installed)
150.3 x 118 x 52mm 150 x 120 x 88 mm 273 x 120 x 52 mm
Warranty 2 Years 2 Years 2 Years

Product Details

Style Name: 240 x 27 mm Radiator/2 Fans
  • Product Dimensions: 10.7 x 4.7 x 1.1 inches ; 2.1 pounds
  • Shipping Weight: 3.8 pounds (View shipping rates and policies)
  • Domestic Shipping: Item can be shipped within U.S.
  • International Shipping: This item is not eligible for international shipping. Learn More
  • ASIN: B00B20OYUY
  • Item model number: RL-S24M-24PK-R1
  • Average Customer Review: 4.3 out of 5 stars  See all reviews (384 customer reviews)
  • Amazon Best Sellers Rank:
  • Product Warranty: For warranty information about this product, please click here
  • Date first available at Amazon.com: January 17, 2013

Customer Questions & Answers

Customer Reviews

Most Helpful Customer Reviews

87 of 89 people found the following review helpful By T. Q. TRAN on April 19, 2013
Style Name: 120 x 27 mm Radiator/1 Fan Verified Purchase
I bought this to replace the stock AMD fan for my Phenom II 945. Here are my observation after one week

Pro:
Keeps the system 10C cooler than the stock fan. Temperature ranges from 30C-35C
With the fan turned off, it performs as well as the stock fan. Temperature ranges from 40C-45C
Cheap

Con:
At full speed, the fan can be as noisy as the stock fan.
Water hoses are a bit short, but this is a subjective point.
Quick disconnects on the hoses would have been wonderful. My case was a little small, so there was no room to mount it internally. I had to cut a large hole in my case rather than route the hoses through the provided water cooling holes.

Overall, it's a great cooling unit for the price. I wanted it to get a bit warmer to "break in" the arctic silver, but I guess that's a good problem to have.

Update:
After one month, I'm still happy with this cooler. I found a setting in the BIOS to make the automatic fan controller not go nuts until it hits 60C. Things are so quiet now that I have to check the power LED to see if the PC is on, even in the middle of the night. I'm guessing I don't have to worry about the pump as long as the LED indicator on the cooler still glows blue.

Update: 3/24/2014
Fast forward one year. This unit is still serving me well. I've since migrated the setup into a modified XPS720 aluminum case, which adds more sound isolation to the unit. My PC is whisper quiet under my desk. The LED is still showing blue whenever I open the case to check it and to clean out dust. I have it running almost 24/7.
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40 of 43 people found the following review helpful By gethstr8 on January 17, 2013
Style Name: 120 x 27 mm Radiator/1 Fan Verified Purchase
i have always been an air cooled person. reading reviews u can always see air coolers just as efficent as liquid cooling for half the price.... i was previously using a zahlman heatsink and i loved it. had a phenom x4 3.5ghz clocked to 4.0 ghz with the zahlman and at idle it stayed around 35c and under full load would hit 62c, this cooler master seidon is currently hooked up to an fx 6300 clocked at 4.0 ghz and at idle it has not gone above 17c and the higest i have seen at load was 42c. installation was extremely easy on my am3+ board (asus sabertooth r 2.0). amd owners just have to use factory mobo backplate as it normally goes with after market coolers for amd sockets. i do agree with other reviews that u have to push hard but the screws have tension springs on them and considering how hard i have had to push on some of the other 200+ coolers i have installed this one isnt bad at all.

now the only problem i have with this cooler is that the fan that came with the cooler was dead!!! ahhh!!! that sucked and actually took about an hour after the build for me to notice, which is good and bad i guess.... it was an easy fix since i have fans laying around everywhere but if u have no extras it may be something u want to ask for. while the fan was not spinning i was installing windows/updating and running some simple programs and using firefox, at a suprise to me the cpu never went above 35c the whole time.... that has to say something for the quality of this product.

all in all i will without a doubt put this cooler in my next several builds in replacement of air coolers....... i love it and could not be happier
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11 of 12 people found the following review helpful By Amazon Customer on February 19, 2014
Style Name: 240 x 27 mm Radiator/2 Fans Verified Purchase
I have a new Antec 1200 case for this, and an AMD FX8350. The instructions were actually easy, and it came with hardware for Intel as well. My ASUS board already came with a backing plate, but this thing is ON that CPU! The clamps take a little common sense to figure out, but when it is on, it is a beauty. The LED is bright enough to see through the case window, and seeing as the 1200 comes with 6 case fans, I tried to line it up with the back 2. What I mean is, the radiator is sitting in between 4 fans (2 from case, 2 from cooler), all blowing the same way (check the fin configuration).

The only regret is that the fan holes on the 'other' side of the radiator from the fans it comes with didn't line up with all 8 holes on the radiator. So I just lined up 4 of them, and it is in there good! This is only something an Antec 1200 case owner would notice-IF they wanted to do something crazy like I did.

I'll upload some pics here to illustrate!

EDIT: Ends up I can;t upload any pics! Luckily, I have them all here:

[...]

I wish I could upload a screenshot of IntelBurn running on all 8 cores, 100% CPU, full RAM... The FX-8350 (8 core) runs all day at 43degF, and completely SLAMMED (100% CPU for 10 minutes, 95% RAM, Visual Studio, MSSQL 2012 SSMS, etc. all running, too), I cannot get it to go hotter than 83degF (and that is Fahrenheit, not Centigrade/Celsius!) I am using 4 fans (2 in front, 2 in back), and the FB Photos will show you the complete installation from unboxing (if Amazon lets me post the URL).
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10 of 11 people found the following review helpful By RussellWilson on July 12, 2013
Style Name: 120 x 27 mm Radiator/1 Fan Verified Purchase
Update 11/22: Finally got the rebate...took so long

I recently built a haswell setup with i7-4770K. Because the cpu is quite capable of overclocking, I decide to go with liquid cooling. I had two choices based on the case and other config, H80i and this Sedon 120M. It seems the H80i is more popular but it is also quite more expensive than this cooler. I decide to go with the 120M, the AR price is about half of the H80i.

So far, I like it very much. The installation process is quite easy. The tubes are very flexible and strong as well. There were moments when I worried about breaking the tubes, but they are absolutely not necessary. I am using a pull config. My CPU runs at several degree C higher then RT when idle. On full loading at 4.3 GHz OC, it is about 50 degree C higher than RT. I didn't install the stock cooler, so don't have any comparison, but I am very happy that it is below 80 C at full load.

The noise is audible if you approach the back of the case, otherwise I consider it to be quiet.

I would definitely recommend this product. The last star would be added when I receive the rebate.

PS. The cooler is now working with i7-4770K and Gigabyte Z87X-UD3H. Check out my review on those devices as well.
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Most Recent Customer Reviews

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