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Item#: N82E16835103179

Cooler Master Seidon 120M – All-In-One CPU Liquid Water Cooling System with 120mm Radiator and Fan

  • 600~2400 RPM (PWM) +/- 10% 19.17 ~ 86.15 CFM +/- 10%
  • Radiator Dim. 150.3 x 118 x 27mm (5.9 x 4.6 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
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.
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-S12M-24PK-R2

Quick Info

Warranty

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


Customer Reviews of the Cooler Master RL-S12M-24PK-R2

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Showing 302 of 302 reviews - Clear Filters

  • Michael N.
  • 7/3/2015 4:02:09 PM
  • Tech Level: High
  • Ownership: less than 1 day
  • Verified Owner

4 out of 5 eggsNew in box failure

This review is from: Cooler Master Seidon 120M – All-In-One CPU Liquid Water Cooling System with 120mm Radiator and Fan

Pros: I own about 5 of these and haven't had a problem before.

Cons: Opened it to a wet bag holding the radiator.

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

  • Anonymous
  • 6/24/2015 12:39:42 AM
  • Tech Level: Somewhat High
  • Ownership: 1 week to 1 month

2 out of 5 eggsIt's just meh

This review is from: Cooler Master Seidon 120M – All-In-One CPU Liquid Water Cooling System with 120mm Radiator and Fan

Pros: it easy to install, mine came with my amd fx 9370 and push/pull fans, and it gets fairly warm with all 8 cores at 4.7ghz (prime 95 torture test) warm like 78C and idle is like 38C

Cons: this is a small radiator, I've read plenty of total failure reviews, and have been monitoring the pump speed and temperatures pretty close especially during load testing, it was free with the processor, going to upgrade this one gets heat soaked too fast and can't release enough heat

Did you find this review helpful? Yes No

  • Sam M.
  • 6/23/2015 10:04:45 AM
  • Tech Level: High
  • Ownership: 1 month to 1 year
  • Verified Owner

4 out of 5 eggsGood cooler

This review is from: Cooler Master Seidon 120M – All-In-One CPU Liquid Water Cooling System with 120mm Radiator and Fan

Pros: This all in one unit makes for easy install. Pump runs quite and steady. Lowered make temps to make OCing a breeze.

Cons: If you do the rebate, prepare for a long agonizing wait.

Did you find this review helpful? Yes No

  • Inderjit J.
  • 6/19/2015 6:30:57 PM
  • Tech Level: Somewhat High
  • Ownership: 1 month to 1 year
  • Verified Owner

5 out of 5 eggsbest value water cooler

This review is from: Cooler Master Seidon 120M – All-In-One CPU Liquid Water Cooling System with 120mm Radiator and Fan

Pros: I have an i7 4790k. Works well, my idle temps are crazy: under 27C. Temps at 100% load, after 3 minutes, max cpu temp on each core averaged 59C. And this is with the thermal paste that came with the cooler. It was mostly painless to install using their video on youtube.

Cons: The instruction manual is meh, definitely needs the video as a supplement. But the manual will tell you one or two things that the video doesn't. Neither make it clear how you move the screw pegs on the heatsink (to line up with the motherboad screw holes). You have to pull on them upward and then you can move them. If you just try to move it (like the motherboard backplate pegs), it won't work.

Other Thoughts: After rebate, it's a great deal. Makes your motherboard look really clean and cools equally if not better than any air cooler out there.

Did you find this review helpful? Yes No

  • Andrey P.
  • 5/29/2015 1:07:54 PM
  • Tech Level: High
  • Ownership: 1 month to 1 year

1 out of 5 eggsShame on You, Cooler Master.

This review is from: Cooler Master Seidon 120M – All-In-One CPU Liquid Water Cooling System with 120mm Radiator and Fan

Pros: 1.) Nice cooling - I was at about 35C at idle and around 50C at full load.
2.) Pretty quiet cooler. CPU fan was silent and the pump is barely audible, you would have to listen for it to hear it.*


*Read cons about pump.

Cons: 1.) I ordered this item in November. It is now May 29 and my rebate is nowhere to be found.. -1 Egg
2.) The coolant pipes are very stiff, making installation harder than it needs to be. -1 Egg
3.) My pump makes a noise now from time to time - almost like a scratching noise.. It does not sound very healthy.... I guess it's on the road to failure? -2 Eggs

Other Thoughts: Disappointed in Cooler Master. My pump has not lasted 7 months. Cooler Master let me down on the rebate too. Never got my rebate.

Manufacturer Response:

Hello Andrey P,

We apologize for the trouble that you are experieincing with the Seidon 120m. The Seidon 120m does come with a 2 year warranty so please contact us for a replacement.

Please note that the rebates are processed through a rebate company and do not go directly to Cooler Master. You can check for updates on your rebate by visiting Status-Now.com.

If no updates are provide then please contact Customer Support so we can assist in this matter.

Phone: 888-624-5099

Respectfully,
Patrick
CMUSA Support

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

  • Lola T.
  • 5/26/2015 4:29:13 PM
  • Tech Level: Average
  • Ownership: 1 month to 1 year
  • Verified Owner

1 out of 5 eggsDO NOT BUY COOLER MASTER!!!

This review is from: Cooler Master Seidon 120M – All-In-One CPU Liquid Water Cooling System with 120mm Radiator and Fan

Pros: Worked well the 4 months it lasted.

Cons: Cooler Master support is the worst I've ever seen. The CPU fan gave out after only 4 months of use and Cooler Master has now had it for a month with no response to my inquiries. My part died on 04/25/15, I brought it in to my local tech store on 04/27/15 who diagnosed the problem, but did not have the replacement part on hand and sent my to Cooler Master RMA. I shipped UPS with tracking on 04/28/15 and had confirmation that it was received and signed for on 04/30/15. I had not received an update, so I contacted Cooler Master on 05/07/15 and was told that their shipping department was having delays and to wait. Cooler Master FINALLY sent an email that they received it on 05/11/15. I opened another ticket on the 05/16/15 inquiring on the status and was told that I would have a reply either the next day or on Monday the 18th and I have not heard back from anyone. I have since tried calling three times - twice to RMA and once to customer service - with no response to any of my messages. Save yourself the trouble and DO NOT BUY FROM COOLER MASTER. Their products don't last long and it is definitely not worth the hassle of getting it fixed. I've lost more money waiting for the replacement that I originally paid for the part.

Other Thoughts: I'm giving up on this RMA process and will probably just buy a replacement part. I can't afford to waste more of my time and money on their nonsense. It's past the point of "shipping department is delayed" and on to "we really do not care one bit about our customers and are just using this as an excuse to give the worst customer service ever."

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

  • JASON S.
  • 5/26/2015 7:37:55 AM
  • Tech Level: Somewhat High
  • Ownership: 1 week to 1 month
  • Verified Owner

3 out of 5 eggs

This review is from: Cooler Master Seidon 120M – All-In-One CPU Liquid Water Cooling System with 120mm Radiator and Fan

Pros: Overall quiet and kept CPU cooler than stock fan/heatsink.

Cons: Pump started making clicking sounds and then after shutdown the pc and rebooted it, the pump was no longer working.

Other Thoughts: Ended up going back to air cooling. I am not one to overclock my PC and was hoping to switch to a ITX case so I wanted this since the space is limited in the ITX cases.

Did you find this review helpful? Yes No

  • Logan M.
  • 5/17/2015 2:58:50 PM
  • Tech Level: High
  • Ownership: 1 day to 1 week
  • Verified Owner

5 out of 5 eggsOC'd hard - Running cool

This review is from: Cooler Master Seidon 120M – All-In-One CPU Liquid Water Cooling System with 120mm Radiator and Fan

Pros: Quiet
Keeps things chilly

Cons: Not compatible with Cooler Master's 430 Black Elite's top fan vents

Other Thoughts: First time user of anything liquid cooled, and I don't think I'm going back. Came with a tube of thermal compound, not pre-applied like the video suggested.

Did you find this review helpful? Yes No

  • Camille Q.
  • 5/16/2015 11:39:11 PM
  • Tech Level: Somewhat High
  • Ownership: 1 day to 1 week
  • Verified Owner

5 out of 5 eggsGreat Cooler!!!

This review is from: Cooler Master Seidon 120M – All-In-One CPU Liquid Water Cooling System with 120mm Radiator and Fan

Pros: Cools my I7 4790K Wonderfully! My CPU stays at 65 and below on full load. Super fast shipping. Does it's job very well. Looks really cool in my case.

Cons: Was harder than I thought it would be to install, not taking an egg off because it was my cases fault. Had air bubbles inside when it came but wasn't to hard to fix.

Other Thoughts: Overall a great cooler and you should definitely pick this cooler up.

Did you find this review helpful? Yes No

  • Anonymous
  • 5/16/2015 10:49:19 PM
  • Tech Level: Somewhat High
  • Ownership: less than 1 day

5 out of 5 eggsDisappointing

This review is from: Cooler Master Seidon 120M – All-In-One CPU Liquid Water Cooling System with 120mm Radiator and Fan

Pros: It looks good.

Cons: Worked with a loud clicking for about 30 minutes then went silent. Checked my temps and they were skyrocketing. The pump died but the led still remains lit.

Other Thoughts: I had high hopes for this and it let me down.

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

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Item#: N82E16835103179
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