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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
  • $49.99
  • $33.99 
  • Save: $16.00 (32%)
  • Free Shipping (restrictions apply)


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).


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!

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  • Anonymous
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Item#: N82E16835103177
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