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Cooler Master > 
Item#: 9SIA24G28M8124

Cooler Master SickleFlow 120 - Sleeve Bearing 120mm Silent Fan for Computer Cases, CPU Coolers, and Radiators (Smoke Color)

  • 120mm
  • 2000 RPM 69 CFM
  • Long Life Sleeve
  • 19 dBA
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R4 series fans offer a unity of maximum rotational speed and optimum airflow. Using a unique long-life sleeve bearing fan, the R4 series offers long life rating of 50,000 hours. R4 series fans perform at a maximum of 69CFM at 2000RPM.

  • newegg High Performance The COOLER MASTER R4-C2R-20AC-GP case fan delivers up to 69CFM of air flow to efficiently and effectively dissipate the heat generated inside the chassis.
  • newegg Silent Operation This fan runs at 2000 R.P.M. and produces mere 19 dB-A noise level bringing peace of mind to you and your co-workers.
  • newegg Constructed to Last The high quality sleeve bearing fan provides maximum of 50,000 hours of lifespan for hassle-free long term use.

Learn more about the Cooler Master R4-C2R-20AC-GP

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Customer Reviews of the Cooler Master R4-C2R-20AC-GP

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  • Frankie M.
  • 3/28/2015 6:32:00 PM
  • Tech Level: Average
  • Ownership: 1 month to 1 year
  • Verified Owner

5 out of 5 eggsGood fan.

Pros: It is indeed quiet.
It has a nice look.
I can feel the cool.

Cons: None that I can see yet anyway.

Other Thoughts: Would like this in an 80mm if they have it then I'll have to grab it sometime.

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  • Anonymous
  • 3/26/2015 9:13:58 AM
  • Tech Level: High
  • Ownership: 1 week to 1 month
  • Verified Owner

5 out of 5 eggsGreat fans

Pros: keeps system cool, very quiet,

Cons: N/A

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  • jeffrey b.
  • 3/15/2015 9:49:37 PM
  • Tech Level: Somewhat High
  • Ownership: 1 month to 1 year
  • Verified Owner

5 out of 5 eggsIts cool man

Pros: A little quieter then my stock fan and moves more air.

Cons: none

Other Thoughts: Using in a push-pull set up as pull.
I found with just the stock fan my case gets warm. With two fans the case stays cool to the touch.
Will buy a second one when the stock fan craps out.

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  • William T.
  • 3/6/2015 8:11:09 AM
  • Tech Level: Somewhat High
  • Ownership: 1 month to 1 year
  • Verified Owner

3 out of 5 eggsWorks

Pros: Moves air.

Cons: Not silent (enough). On low speed, it is tolerable. At higher speeds this fan is louder than all of my other fans combined.

Other Thoughts: The 'Cooler Master' sticker in the middle was not centered when it was installed, so when the fan is running it is "wobbly" or unstable looking. Not a big deal. I have now replaced this fan with a different make. It works, so I'm keeping it for a backup fan.

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  • John J.
  • 2/19/2015 12:25:22 PM
  • Tech Level: High
  • Ownership: 1 month to 1 year
  • Verified Owner

5 out of 5 eggs

Pros: Has more blades than the fan that came with my CoolerMaster CPU cooler. Keeps CPU around 30 to 40 degress without liquid cooling.

Cons: None

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  • Matthew M.
  • 2/19/2015 10:35:47 AM
  • Tech Level: Somewhat High
  • Ownership: 1 month to 1 year
  • Verified Owner

1 out of 5 eggsNoisey

Pros: Was quite when it was new.

Cons: Within two weeks the fan started making noise. I removed the fan from the case thinking the fan blades was hitting something. Still had noise. I discovered that the fan blades can actually be removed from the fan assembly just by pulling it off. They are held on by friction. I powered the fan without the blades in place and the motor was the source of the noise. I put my old fan back in. Even with it being 6 years old it is still much quieter.

Manufacturer Response:

Hello,


I am sorry to hear about the issue you had with our fan. In the future, if you ever have any problems with one of our products, feel free to give us a call at (888) 624-5099.


Sincerely,

Eric
CM USA Support

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

  • Wallace E.
  • 1/17/2015 4:34:48 PM
  • Tech Level: High
  • Ownership: more than 1 year
  • Verified Owner

2 out of 5 eggsMuch less than stated 50K hour life

Pros: Worked well for about 25K hours.

Cons: Began making some bearing noise after about 25K operating hours. Fan unit completely separated from housing after less than 30K hours.

Other Thoughts: I bought this in March 2011 to replace one of three case fans in a LianLi case. This began grinding in December 2014 and came apart soon after. Meanwhile, one of the original case fans is still spinning away quiietly.

Manufacturer Response:

Dear Customer,

We are sorry to hear what happened to the fan. We can definitely help in replacing that fan under warranty. To ensure fans live their rated life, it is imperative that they are cleaned regularly as dust that is not cleaned, can definitely cause a fan to fail. If you have further questions, please let us know.

Respectfully,


CMUSA Support

Phone:
1-888-624-5099

Site:
http://account.coolermaster.com

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  • Manny R.
  • 1/16/2015 8:44:42 AM
  • Tech Level: High
  • Ownership: more than 1 year

4 out of 5 eggsGood fan with a few caveats. Corsair H100 owners take note here.

Pros: Relatively inexpensive and move a good amount of air. For the air they move the noise level is acceptable.

Cons: - CORSAIR H100 USERS TAKE NOTE HERE. THE FAN CONTROLLER ON THE H100 *DOES NOT* PLAY WELL WITH THESE FANS!
- Not exactly quiet at full speed, but that's a given.
- Fan blades aren't removable and there's no direct access to the fan bearing (so you can't add a drop of dry lubricant to it every now and then unless you resort to some modding. More on that in a moment.

Other Thoughts: I've owned several of these fans over the years ( some red LED versions and now four of these specifically) and have been extremely happy with them. After a while the bearing does start to go, but given the price it's not a huge deal.

I bought four from another vendor to replace the extremely noisy fans on my Corsair H100 cooler. If you have a non-PWM based fan controller and you hook up the fans to that instead of to the fan controller on the H100, you'll be fine. If you attach the fans directly to the H100, you're just begging for trouble.

Five minutes after installing the fans and hooking them up to my H100, the distinct smell of overheated plastic became noticeable. For whatever reason, the fans (ALL FOUR OF THEM) were getting extremely hot and spinning up and down on the H100's controller. Thankfully I figured out what was going on and was able to shut everything down before they were permanently damaged. Right now all four are attached to a voltage resistive type fan controller in my system and they're happily spinning without going into thermonuclear meltdown.

The reason I knocked off an egg wasn't because of this issue though. I knocked off an egg because unlike some other fans, there's no easy way to get at the fan bearing to add some lubricant every now and then. Some fans have an opening at the back of the fan and either a sticker and/or a rubber plug that seals it against dirt. It's great if you're religious about maintenance or if you have a noisy fan and you want to add a drop of oil to silence it.

If you don't have that access hole, you'll either need to take it apart, replace the fan, or resort to some surgery using a drill and a small drill bit to add you own hole (which is what I ended up doing to mine).

I'm not sure if it's because of the little overheating experienced when plugged into my H100 or if they were like this from the factory, but all four of my fans were running noisy. It's probably because they're technically running upside down to be honest, but the way I was able to silence them was to drill a small hole directly in the middle of the back of the fan (where the metal shaft of the fan hub would be), add a few drops of Teflon based bicycle chain dry lube, and then seal the hole with some tape. Yeah I voided the warranty by doing that, but my fans are a lot quieter now. :D

Overall I'm really happy with these fans. I just wish they made a PWM version of them and that Cooler Master made a higher quality version of it where you can access the fan bearing if needed. I know it sounds silly but it's little things like that that this old dog looks for.

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  • Guillaume P.
  • 1/15/2015 1:42:58 PM
  • Tech Level: Somewhat High
  • Ownership: 1 month to 1 year
  • Verified Owner

5 out of 5 eggsGood fan

Pros: Good air flow low noise

Cons: none

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  • James A.
  • 12/29/2014 1:46:01 AM
  • Tech Level: Somewhat High
  • Ownership: 1 week to 1 month
  • Verified Owner

4 out of 5 eggsreview of cooler master sickleflow 120mm silent fan

Pros: * quiet
* cheap fix for a broken cpu fan or for replacing a obnoxious loud fan
I bought this product as a replacement for a cpu fan that had a busted bearing it was a cheap fix but honestly i was surprised with how quiet and well it preformed for the price i expected to only use it as a quick fix to keep everything cool until i bought a more quality product but it has beat all my expectations its quiet which is important when recording voice overs or anything else and even when you do hear it the fan gives off a gentle thrum rather then the rattle of my old fan

Cons: a little slow to delivery but i ordered on the holidays what can you expect

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Cooler Master > 
Item#: 9SIA24G28M8124
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