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Silverstone > 
Item#: N82E16835220014

SILVERSTONE FM121-B 120mm Case Cooling Fan

  • 120mm
  • 800-2400 RPM Max 110.03 CFM
  • 2 Ball
  • 17-39.5 dBA
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If you need the ultimate in airflow SilverStone’s FM121-B is the way to go. It has a unique 9 blade design that coupled with its 2400max RPM provides a massive 110.03CFM of air flow. Unlike many variable speed fans that only have three speed settings you can use the 3.5” bay mounted controller to set the speed from 800-2400RPM depending on your needs.

  • newegg Unique 9-Blade Design The innovative 9-blade SilverStone FM121-B provides supreme cooling and elevated quietness.
  • newegg Silence or Power in One Unique Package The SilverStone FM121-B produces an ultra-low 17dBA noise level at 800rpm and boosts airflow to up to 110CFM at the maximum 2400rpm for incomparable cooling performance.
  • newegg Stylish Aluminum Fan Controller The included aluminum fan controller enables convenient fan speed adjustment to fit any given application with its outstanding aesthetic design to show your exclusive style.

Learn more about the Silverstone FM121-B




Case Fan
Fan Size
Bearing Type
2 Ball
800-2400 RPM
Air Flow
Max 110.03 CFM
Noise Level
17-39.5 dBA
Power Connector
3 / 4 Pin
White Fan , Black Panel

Physical Spec

120 x 120 x 25mm


The FM121 is a superb 120mm fan package with manual adjustable fan controller. Equipped with 9 fan blades, it offers elevated quietness and performance levels beyond traditional 7 bladed fans. Finding a perfect speed for this fan in any given application is simple on the included aluminum fan controller. Constructed out of high strength white colored plastic and polished to a smooth shine, the FM121 is the ultimate solution for any PC and HTPC enthusiasts looking to upgrade their 120mm fan.

Package Contents

Package Contents
Case Cooling Fan
Fan Grill
Fan Speed Controller

Manufacturer Warranty

1 year

Quick Info


  • Limited Warranty period (parts): 1 year
  • Limited Warranty period (labor): 0 day

Customer Reviews of the Silverstone FM121-B

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  • shelby p.
  • 11/8/2014 8:06:10 AM
  • Tech Level: High
  • Ownership: 1 month to 1 year
  • Verified Owner

5 out of 5 eggsFANtastic!

Pros: They work extremely well. I bought them to replace the two fans that came with the Corsair H75 liquid cooler because those stock ones weren't cutting it. It's been a few months now so I don't remember the exact decrease in temperature these fans produced but I want to say it was in the neighborhood of 9-12 degrees celcius.

Cons: See other thoughts

Other Thoughts: Not adding this as a con since the fans work very well and I have been completely pleased with them but the 3 pin header they come with for power aren't really a great option. You're supposed to plug them into the fan controllers that come with them but if you don't want to use the included the fan controller, you have to use molex which means going directly into the psu which means they spin at full speed all the time. Now, not really a big deal but! these fan are quite loud at full speed.

So you basically have to choose between really loud fans, or mounting their fan controller in your case and that wasn't an option for me.

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  • Jason W.
  • 9/14/2014 10:05:16 AM
  • Tech Level: High
  • Ownership: more than 1 year
  • Verified Owner

2 out of 5 eggsOff the rails in one year

Pros: The manual adjustment made it possible to extend the life of a graphics card that was getting on in years by kicking up the cooling when needed.

Cons: After a year of operation, the fan is getting very noisy. I have adjust the speed often in order to get it out of a wobbling pattern that is very noisy. I will have to replace it again.

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  • David S.
  • 6/25/2014 6:56:42 PM
  • Tech Level: High
  • Ownership: more than 1 year
  • Verified Owner

5 out of 5 eggsSilverstone 110cfm fans

Pros: I LOVE these fans! Bought my first pair from Newegg over 5 years ago, still running like new.

They really do move some air!

Cons: At full speed, they are loud!

Other Thoughts: I use my original 2 fans on an old Cooler Master CPU cooler that takes 2 120-mm fans on an old LGA775 QX6700 quad extreme, that happily runs at 12x or about 3.2ghz, at a happy ~60C under full heavy load. The speed sensor wires are plugged into the cpu fan sockets. Usually pretty quiet that way?

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  • James W.
  • 3/12/2014 5:22:51 PM
  • Tech Level: Average
  • Ownership: 1 month to 1 year
  • Verified Owner

5 out of 5 eggsWorks Well

Pros: High 110 CFM for your $. Moves alot of air. Quiet yet effective at lower RPM.

Cons: Loud at high RPM. Some people may not like the manual control.

Other Thoughts: I recomend them if you dont mind the manual control.

I used two of these to relpace the 77 CFM Corair fans on my Corsair H100i CPU liquid cooler. It made a big difference on my Haswell i7 build. @ 4.5 GHz I was reaching 85* C playing the CPU intensive FSX. With these fans at full blast I manage 75*C @ 4.6 GHz 1.227v and 90*C @ 4.7 Ghz 1.278v. I only tested 4.7 Ghz briefly, 90*C is too high for my liking. 4.8 Ghz fails an intel CPU stress test and it also throttles down if stable. I wired both fans to a single controller and i usually let them idle for normal everday computing. Skyrim only needs about 50% and I rarely hit 60*C.

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  • Lawrence L.
  • 5/18/2013 1:18:59 PM
  • Tech Level: Somewhat High
  • Ownership: 1 day to 1 week
  • Verified Owner

5 out of 5 eggsThird Time the Charm

Pros: Plenty of kick to FORCE air into a case (my use, see Other Thoughts).

Fan controller nice addition to "tune" air flow, providing tradeoff of flow to noise.

Would not put one of these in an HTPC, but if cooling is your primary concern, this is it. Besides, having worked in a server room for many years, bit immune to fan noise.

Cons: Sheepishly admit it took me a couple of minutes to figure out where to connect fan controller. There's a SHORT black wire 2 pin connector for this on the fan; controller wires plenty long to reach.

Also admit, on receipt, thought Newegg had shipped the wrong fan. Had ordered both the FM121 and FM121-B fans. BOTH have FM121 on front of box; displayed fans both white. The side of the box has the [silver | black] (for fan controller color) noted.

Other Thoughts: Have 2 Sans Digital MobileSTOR MS4UM+B external 4 bay cases. Even with the on-board rear exhaust fan set to high, disks, on PROLONGED transfers, start to heat up above my comfort zone. The case's front door drops down flat, and the front disk retaining bracket can be removed. A 120mm fan sits quite nicely on the laid down front door.

Have an expansion bracket PCI power panel w/(3) 4 pin power connectors on back of case, with an Okgear 48" 4 pin molex sleeved fan cable extension run to external case shelf.

1. First try: Cooler Master R4-S2S-124K-GP 120mm Case Fan which I had on hand. While it might be fine for removing dead air inside a case, not the "throughput" I was looking for.

2. Second try: Silverstone Air Penetrator AP122 120mm Case Fan. While its "directed" air flow was a bit stronger (using the "hand test"), still not the "throughput" I was looking for.

Now I did what I should have done in the first place: used Newegg search tools to look for HIGH CFM 120mm fans.

3. Third try: Silverstone FM121-B 120mm case cooling fan. WINNER. ADDED bonus: the INCLUDED fan controller. Even at 50%, plenty of "push" to force air into the case. If a disk starts to run hot, can just crank up the fan.

Certainly no louder than the on-board fan when set to high.

Not using the included "3rd monitoring wire" as it's being used to cool an outside case.

Might even play around with "tuning" noise, adjusting exhaust fan speed (3 speeds) and this intake fan for optimum cooling/noise level.

Bottom line: if you need to force air somewhere, this fan can do it.

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  • Haken E.
  • 2/23/2013 9:11:47 PM
  • Tech Level: Somewhat High
  • Ownership: 1 day to 1 week
  • Verified Owner

5 out of 5 eggsis good

Pros: this paired with the noctua nh-d14 is amazing. i've got this fan mounted of the back directly lined up with my noctua keeping my cpu chilling at 15-23 Celsius sometimes going up to 32 when playing a game.

Cons: nob could be more sensitive, but it does a good job, no egg for that. good fan

Other Thoughts: i would recommend this product, good so far.

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  • Jeremy C.
  • 2/11/2013 1:28:14 PM
  • Tech Level: High
  • Ownership: 1 day to 1 week
  • Verified Owner

5 out of 5 eggsSuper Quite Fan

Pros: Great fan, not using the fan controller and am quite happy with the noise level at full power. My 80mm Vantec fans are about 100x louder than this fan so I wouldn't have cared anyhow.

Cons: None

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  • Anthony D.
  • 2/6/2013 6:03:09 PM
  • Tech Level: Somewhat High
  • Ownership: 1 week to 1 month
  • Verified Owner

5 out of 5 eggsUsing as a CPU fan

Pros: Awesome fan, way better then the stock fan that came with my Coolermaster V8, the temps are much better with this fan. CPU cores are in the low 30's and under load don't even get out of the 50's. Much better temps then with the stock fan.

Cons: None really, besides when it is at max fan speed it is pretty loud but there is no reason that should be a con.

Other Thoughts: The fan controller works perfectly, only down side is i didn't have a floppy disk drive compartment in my case so i had to run the fan speed controller out the back of my case and just have the wire on the side of my case and the controller sit on the top of my case, which is fine by me.

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  • jamaal g.
  • 1/10/2013 6:39:39 AM
  • Tech Level: Somewhat High
  • Ownership: 1 month to 1 year
  • Verified Owner

5 out of 5 eggsnice

Pros: bought this fan side witht the noctua to see which works better, and this has a better focus of aitflow. Got my temps down quite a bit from upgrading from my corsair and rosewill fans.

Cons: can be quite loud on full. Doesnt bother me much being that this is for a media center and sits across the room from me, but if it were specific for a gaming pc i would prefer the noctua

Other Thoughts: overall for my needs, works better than the noctua. swapped my noctua fans for rear and top output and thesse bad boys for direct airflow on my heatsink. lowered by around 4 degrees

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  • Hudson T.
  • 1/5/2013 4:56:44 PM
  • Tech Level: Somewhat High
  • Ownership: 1 week to 1 month
  • Verified Owner

3 out of 5 eggs

Pros: -moves a ton of air

-unmatched static pressure at the 120mm size

-very nice looking controller panel and knob.

Cons: -needs a 2 connector, your 3 pin controller panel won't work unless you do some chopping and splicing

-NOISY. like a wimpy vacuum cleaner. it's rated at 40dba. according to most charts, this is very low ambient. laughable. this thing does not produce 110cfm at ambient noise levels.

- fan frame prevents usage as a cpu fan. it's a solid bushing from one hole to the other side. have a look at cpu fans. they aren't connected because you need a way of insterting the retention clips

Other Thoughts: this would have made a fantastic cpu fan. unfortunately, the frame style precludes that. i might do some chopping and sanding to get rid of the straight through bushing

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Item#: N82E16835220014
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