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Cooler Master > 
Item#: N82E16835103177

Cooler Master GeminII M4 - CPU Cooler with 4 Direct Contact Heatpipes

  • 500 - 1600 RPM (PWM) +/- 10%
  • 17.4 - 58.4 CFM +/- 10%
  • 4 Direct Contact Heat Pipes
  • Aluminum Fins
This product qualifies for the Iron Egg guarantee. We'll match any qualifying competitor's price.
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Redefining cooling performance for space restricted environments, GeminII M4 is engineered to maximize cooling with its minimal CPU contact gaps and four extremely efficient direct contact heat pipes that provide excellent heat dissipation. Standing at a mere 59mm / 2.3in tall, it is uniquely suited to thrive in the small spaces afforded to CPU coolers in HTPCs and other slim systems.

A unique heat pipe layout is utilized that orients the heat pipes to direct the flow of heat more efficiently to the aluminum fins where the heat is exhausted. Much like the GeminII S524, GeminII M4 features an airflow design that is 90 degree rotated to avoid heat radiating from the motherboard. In turn, this orientation simultaneously provides a steady airflow to motherboard chipsets surrounding the CPU socket.

  • newegg All are for cooling The 4 direct contact heat pipes, in “U-shape” and “C-shape” layout, go through base and aluminum fins for efficient heat conduction and dissipation. Besides that, the newly developed slim fan delivers impressive airflow cooling with up to 58.4 CFM airflow. On top of that, the base is engineered to offer minimal gap between CPU and heatsink to maximize heat transfer to your heatsink.
  • newegg Not only cool CPU Besides voluminous airflow, the included fan delivers 90 degree rotated airflow to avoid heat radiating from the motherboard and cool motherboard chipsets surrounding the CPU socket.
  • newegg For limited space applications GeminII M4 is only 59mm/2.3in in height with fan* attached, perfect for use in HTPC or slim systems. (*the fan is only 15mm thick.)

Learn more about the Cooler Master RR-GMM4-16PK-R2


GeminII M4


Fan & Heatsinks
Fan Size
Intel LGA 2011 / 1366 / 1156 / 1155 / 775/1150
AMD FM1 / FM2 / AM3+
Bearing Type
Long Life Sleeve Bearing
500 - 1600 RPM (PWM) +/- 10%
Air Flow
17.4 - 58.4 CFM +/- 10%
Noise Level
8 - 30 dBA
Power Connector
4 Pin
Heatsink Material
4 Direct Contact Heat Pipes
Aluminum Fins

Physical Spec

Fan Dimensions
120 x 120 x 15mm
Heatsink Dimensions
120 x 118 x 44mm


Super low profile cooler (59mm / 2.3in height) with 4 direct contact heat pipes.

A base engineered to minimize CPU contact gaps provides excellent heat conduction.

Suitable for limited space applications (e.g. HTPC or slim systems).

Newly developed thin fan profile delivers uncompromised cooling performance in a compact package.

Unique heat pipe layout combines two very effective cooling methods to increase cooling efficiency while maintaining a low profile heat sink

Quick Info


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

Customer Reviews of the Cooler Master RR-GMM4-16PK-R2

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  • Darlene J.
  • 8/14/2014 1:29:47 PM
  • Tech Level: Somewhat High
  • Ownership: 1 week to 1 month
  • Verified Owner

5 out of 5 eggsWorked Out Great

Pros: Slim, dimensions are precise, quiet, cool, great purchase for it's price. It is a major upgrade from my old cooler. It fit perfect, runs smoother and is so much more quiet It's awesome :)

Cons: None so far!

Did you find this review helpful? Yes No

  • Brian C.
  • 7/21/2014 10:53:03 AM
  • Tech Level: High
  • Ownership: 1 day to 1 week
  • Verified Owner

5 out of 5 eggsmuch better lower temps on amd am3+ processor

Pros: Lower temps. I averaging nice low temps in the 28 to 30 C marks. It normally was in the 42 and 50 C range. This fan and heat sink is great. Just be careful and make sure to install the thermal paste as that really helps with transferring the heat from processor to the massive heat sink.

Cons: Have to remove the motherboard to install. The bracket has to be installed from under side the motherboard. As this is a con for the install, but a pro for the quality of the product. RAM on some motherboards will not fit this heat sink and fan. It did fit on mine, but I know other boards might have trouble clearing ram sockets or if you have very large heat sinks on your ram it might conflict with the space.

Other Thoughts: Price is good, temp is really good. If your unsure of how to take apart a computer this fan might need to be install professionally. As you do need to remove the motherboard in order to mount.

Did you find this review helpful? Yes No

  • Frank S.
  • 7/13/2014 9:26:06 AM
  • Tech Level: High
  • Ownership: more than 1 year
  • Verified Owner

5 out of 5 eggsQuiet, Fast, Long lasting fan.

Pros: Easy to install bracket is secured by four large nuts. Direct heat pipes. Quiet and long lasting.

Cons: Overhangs memory and key motherboard screws. Only go for this if you have a very hot CPU that is crying out for quiet fan and direct heat pipes.

Other Thoughts: Reduced my core temp on FX 8350 by 5C,. Fast cooling of liquid without the expense. Large fan helps cool north bridge and memory.

Did you find this review helpful? Yes No

  • Anonymous
  • 4/18/2014 8:36:46 AM
  • Tech Level: Somewhat High
  • Ownership: 1 month to 1 year
  • Verified Owner

5 out of 5 eggsgood

Pros: Much quieter than the standard AMD heatsink/fan.

Replaced stock fan/heatsink in HTPC use, and I've hit a max of 53C after running a playlist of 1080P flash videos overnight (something that would get past 85C and cause thermal shutdown with the standard heatsink/fan after a couple hours - the HTPC isn't in a place with the best ventilation).

Idles in the 30-35C range, with moderate usage in 40-45C range (with stock it was idling in the 40-45C range and moderate usage would take it to 55-65C).

Easy to swap out the fan if needed/desired. Has a couple thin wires holding it in a makeshift bracket of sorts, which would be easy to disconnect from the stock fan and should fit any 120mm fan with standard screw holes.

The stock fan seems to be working well and mounted adequately (though, being an HTPC, I do have the computer set so that the motherboard is horizontal, rather than the normal vertical tower usage, so the bracket isn't exactly stressed at all).

Cons: As mentioned by others, the four heatpipes sit directly on the CPU (not a problem) and have a bit of a gap between the edge of the pipes and the other metal of the cpu/heatsink interface (it's not flush or smooth, which could be a problem). There are 8 of those edges/gaps (one for each edge of the heatpipe x 4 heatpipes) and they stretch across the entire face of the interface.
Thus far I've had no problems with heat, so it seems to be working ok, but it could be a possible issue in the future or for those with a hotter running cpu.

Instead of using the usual circle or x shape of thermal paste (using AS 5), I put small lines on each heatpipe, with a small circle in the middle, so as to hopefully fill in those gaps between the cpu and the heatsink.

As mentioned by others, there is the possible con that the heatsink is low but wide - for my setup it would've gone over my ram in one orientation (not hitting the modules, but only maybe 1/16" clearance over them), and after turning it 90 degrees, it is still right up next to the slots (I could still get it out to change or upgrade if needed, but it'd be tight)

Other Thoughts: My HTPC system:
CPU - AMD Phenom II 840
Mobo - MSI 880GM-E41 AM3
Case - Silverstone ML03B

It's not specified very well on newegg, but on my box it notes the sockets supported are:
Intel 2011, 1366, 1156, 1155, 1150, 775
AMD fm2, fm1, am3+, am3, am2

In the setup above, I have a good inch or two over the fan before hitting the case - it really is a small heatsink (smaller than the stock AMD one), it's just really wide.

Mounting directions were good. For this AMD mount they had separate brackets for if you wanted it mounted normally or rotated 90 degrees. I believe the single Intel mount just allows you to rotate it without actually using a different bracket.
Annoyingly, you will probably have to remove the motherboard from the case (unless you can get to the four or so inches around the cpu socket from the bottom side a different way).
It uses the same mounting system as much larger coolers from the same company (such as the V8 RR-UV8-XBU1-GP, which I have two of; probably a bit of overkill on mounting hardware vs the size of the heatsink) - you screw the brackets onto the heatsink corresponding with your socket (AMD or Intel), put it through the holes on the mobo, put on a backplate, and bolt it on (usually being a tricky maneuver for those without 3-4 arms or someone else to help them hold it while bolting - and yes, actual bolts, not screws).

But yes, working well and I'm happy thus far!

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

  • Xang X.
  • 4/12/2014 3:13:56 PM
  • Tech Level: High
  • Ownership: more than 1 year
  • Verified Owner

5 out of 5 eggs

Pros: So much better cooling than stock. decent profile.

Cons: It's about a year and none so far

Other Thoughts: Bought this to cool an office computer and does its job. NO problems with standard RAM clearance, and fans falling off. There are grooves underneath the fins. I had it mount on vertical motherboard and no problems at all for about a year now.

office build:

asus socket 1155 h67 mini micro-mb
intel I3 2120 sandy w/ this cooler
2x4 hyper x
120 gb hyper x ssd
stock micro tower case w/ stock 450 psu

Did you find this review helpful? Yes No

  • 3/6/2014 3:37:45 PM
  • Tech Level: Average
  • Ownership: less than 1 day
  • Verified Owner

5 out of 5 eggsDidn't do my research

Pros: It does an EXCELLENT job cooling and is, compared to the stock AMD heatsink fan, whisper quiet.

Cons: The base isn't flat and has deep grooves between the heatpipes. This, of course, requires different TIM application methods compared to flat-based heatsinks.

It is wide and only fits one way for AMD boards, dependent on how the board's original mounting bracket is placed. This means poor compatibility for mini-itx motherboards, as this heatsink can easily block PCIe slots and ram slots. If you do proper research, this shouldn't be a problem.

Other Thoughts: I didn't do my research. I bought a great product that just wasn't for my motherboard, a Gigabyte F2A88XN-Wifi FM2+ board.

The heatsink wasn't rotatable 90 degrees, so I lost both my first ram slot (standard height ram would not fit, I suspect low-profile wouldn't also) and my PCIe slot. The heatsink was also right over my CPU 4-pin plugin spot, so it made it incredibly hard to plug in my power supply.

Had I done proper research before buying this heatsink, and basic observations, I would never have bought this heatsink and my problems would have been non-existent.

Things to look for when using this in a mini-itx build are:

1. How far are the ram slots compared to the socket?

*Note that mounting brackets perpendicular to the ram slots may mean you will lose one of your ram slots, since you won't be able to turn the heatsink 90 degrees.

2. How close is my socket to the PCIe slot?

*never be willing to bend your graphics card to make it fit, it needs to be level and not touching the CPU heatsink.

3. Where are my audio/usb/CPU power plugs on the motherboard? Will the heatsink obscure them or keep me from being able to easily add or remove the plugs?

Keep these things in mind and I'm sure none of you will relive my stupidity.

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

  • Alexander M.
  • 3/6/2014 6:46:50 AM
  • Tech Level: High
  • Ownership: 1 day to 1 week
  • Verified Owner

4 out of 5 eggsNice and Quite

Pros: Good cooling capacity. Nice and quite operation. Using this on LGA1156 board in a small HTPC case.

Cons: Backplate for necessary for LGA1156 socket can pose problems with some Gigabyte motherboards. My motherboard, GA-H55N-USB3 (rev. 1.0) has a couple of chips on the underside of the board, right next to the CPU cooler attachment holes so the backplate presses on a couple of those chips.

Did you find this review helpful? Yes No

  • Roland L.
  • 2/19/2014 9:23:50 PM
  • Tech Level: Somewhat High
  • Ownership: 1 month to 1 year
  • Verified Owner

4 out of 5 eggsHelps with Kaveri Cooling!!!!

Pros: This cooler was perfect for my dads build. Small form factor. Well small is relative I guess. It does work with FM2+ sockets meaning it works with Kaveri APUs. Does a good job too in the cooling department. Dropped the Kaveri's temps from 43c with stock cooler to 33c.

Cons: Sadly like I mentioned small form factor is relative. It will cover the first slot on your RAM DIMM's so make sure your using low profile ram if you want more than 16 GB of RAM. But since the Kaveri needs faster RAM this is easy. Two DIMMs of 8 gigs each and you have 16 GBs.

Other Thoughts: Other than cover the first DIMM slot on the motherboard this cooler is a big plus for Kaveri APUs. The fan is a funky size but You can replace it with a 120mm fan easy enough.

Did you find this review helpful? Yes No

1 out of 5 eggsDid not fit LGA 2011

Pros: Fits in rack mount cases (fits 3U, maybe smaller).

Cons: I tried every way, including putting significant force on my nice new ASUS server motherboard. The screws on the LGA 2011 mounts simply could not be made to reach into the female threaded sockets of the mounting posts on the motherboard.

They would barely even touch...the screws were just not long enough.

Other Thoughts: There is another review on here about forcing this to fit an LGA 2011...mine was too far off to be forced...probably some design and QA problems (screw should be long enough to screw into the posts, not just meet them).

Manufacturer Response:

Hello Christopher,

We apologize for the trouble that you are experiencing with the GeminII M4 cooler. The GeminII M4 will fit the 2011 socket.

Please contact us for a replacement accessory kit and further trouble shooting.

Phone: 888-624-5099

CMUSA Support

Did you find this review helpful? Yes No

  • Ralph K.
  • 2/8/2014 12:07:47 AM
  • Tech Level: High
  • Ownership: 1 month to 1 year
  • Verified Owner

1 out of 5 eggsGemini cooler

Pros: Very hard to deal with

Cons: Very hard to get on the MB and then the fan fell off.
Little wires left me bloody and the gemini in a box
my wife wants to throw in the garbage. Never could get it back together.

Other Thoughts: Wish I wasn't so embarassed by my handicap I didn't scream art Newegg, but they didn't try to put this thing on with
peripheral neuropathy.

Manufacturer Response:

Hello Ralph,

We apologize for the trouble that you are experiencing with the GeminII M4 cooler. Please contact us for further trouble shooting.

Phone: 888-624-5099

CMUSA Support

0 out of 4 people found this review helpful. Did you? Yes No

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