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Item#: N82E16835114099

Dynatron K985 92mm Ball CPU Cooler for Intel LGA Socket 1151 / 1150 / 1155 / 1156

  • At Duty Cycle 0~20%: 700 RPM At Duty Cycle 50%: 1400 RPM At Duty Cycle 100%: 2500 RPM
  • At Duty Cycle 0~20%: 14.98 CFM At Duty Cycle 50%: 29.90 CFM At Duty Cycle 100%: 46.96 CFM
  • Aluminum Radial Fin

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  • Specifications
  • Warranty & Returns
  • Reviews

Learn more about the Dynatron K985

Warranty, Returns, And Additional Information
  • Warranty
  • Limited Warranty period (parts): 1 year
  • Limited Warranty period (labor): 1 year
  • Read full details

Customer Reviews of the Dynatron K985

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  • Anonymous
  • 1/25/2016 1:52:07 PM

5 out of 5 eggsGood value-for-dollar heatsink/fan for Intel 55-65 W CPUs

Pros: Dynatron's P985, K985, and K987 are all very similar. The blue tops (P985 and K985) have a two-ball fan and the red top (K987) has a one-ball fan. There might be slight differences between the heatsinks, but I cannot see any. Dynatron's website indicates that the blue-label fan has slightly higher airflow versus the red-label fan. Dynatron customer support told me that the fan assemblies could be swapped between the three units, but one would need to be careful not to bend the fins of the aluminum heatsink. At idle, neither the blue nor the red fans make any noise.

Any of the three units could be installed on LGA 775, 115x, or 1366 by using the proper mounts, which consist of a metal piece which screws onto the bottom of the heatsink and one or two pieces which anchor the heatsink onto the motherboard. However, if you bought a model intended for a different socket than the one you have, you'd have to buy the proper mounts from Dynatron, except for K987 which includes mounts for LGA 775, 115x, and 1366.

The bottom of the heatsink exhibits a large copper base. Some of the units come with pre-applied thermal paste and others come with a small tube of it. The latter ones have a clear plastic protector which must be removed. It brought the idle temperature of a 65 W i5 Sandy Bridge CPU down to 25 C and a 95 W i5 Sandy Bridge CPU down to the high 20s. However, while running Intel's IPDT, the 65 W i5 Sandy Bridge CPU rose to 50 C, while the 95 W i5 Sandy Bridge CPU rose to the low 60s. I would not use these heatsinks for gaming, overclocking, or applications where a high-wattage CPU would be stressed on a regular basis.

You will need to remove the motherboard from the case unless your case has a cut-out which allows access to the rear of the board. The metal pieces which anchor the heatsink have a sticky side, but I removed it with thumbnails and Goo-Gone for ultimate flexibility.

Cons: None, for the money.

Other Thoughts: I wish Dynatron would sell mounts for AMD CPUs.

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  • Michael F.
  • 5/14/2013 2:28:02 PM
  • Ownership: 1 month to 1 year
  • Verified Owner

5 out of 5 eggsWorks with Socket 1155

Pros: Although listed for only LGA 1156 motherboards, I just installed the second one on an LGA 1155 motherboard (both Biostar TZ77XE3), so I know they fit; see the Dynatron website also. And they cool well, keeping my Ivy Bridge i7-3770 (not overclocked) at around 65 C in a 68 F room in a well-ventilated case. Note that my CPU runs World Community Grid (CEP2) at 100% load, and so the temps would be lower in less-demanding use.

Also, it is quiet, less than most of the other case or GPU fans.

But the best part is that it uses a backplate (actually two back braces would be more accurate), instead of those miserable push-pins that I have given up on, so it is relatively easy to mount securely.

Cons: I haven't found any.

Other Thoughts: You should mount this HSF before mounting the motherboard in the case, unless you have access to the backside of the motherboard, as I do with my Antec case that has a cutout under the CPU socket (very convenient). I have however managed to slip the back braces under a mounted motherboard when required to, by loosening a few mounting screws, but that is the hard way.

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

  • Jonathan E.
  • 10/11/2012 4:44:13 PM
  • Ownership: 1 day to 1 week
  • Verified Owner

5 out of 5 eggsBest cooler

Pros: This is a beefy OEM-style downdraft cooler. It is MUCH better than the stock cooler. It rates up to 130 watts of dissipation, so it is ideal for 55-95-watt Intel Sandy Bridge and Ivy Bridge CPUs. I am running a Core i3 3225. Started with the stock cooler, then tried an "overprovisioned" Intel 95-watt model with copper core. Fan suddenly started making noise, so I tried the Dynatron K985. Best cooler choice ever, and I have tried the bulky tower models in the past. Compared to the Intel model, it is more than 10 degrees cooler under load. All told I've gone from 60 deg to 45 deg on the hottest core under load, and about 10 deg cooler than the 95-watt Intel cooler. Idles didn't change much from the Intel 95-watt cooler, but are around 8 deg cooler than the original stock cooler.

Cons: None.

Other Thoughts: Someone mentioned something about this being difficult to install. If your case has a cutout for the backside of the motherboard, just take the two halves of the bracket and tape them to the underside of the motherboard. Then place the case down so the motherboard is face up and get hold the underside of the bracket where you are screwing down, and it will all go quickly. I recommend the Arctic Silver thermal interface remover and purifier to remove the residue from the old cooler, but note that I did use the pre-applied thermal interface material on the K985.

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

  • Anonymous
  • 8/28/2012 6:54:20 PM
  • Ownership: 1 month to 1 year
  • Verified Owner

5 out of 5 eggsBetter than OEM

Pros: I use this on almost every build. Obviously it's no gaming cooler, but great for light to medium builds. Screw-in mounts are awsome, push pins make me nervous. The big copper slug in this thing is missing from most OEM Intel coolers. 4 pin connector means mobo fan control, fantastic...

Cons: Quite a bit bigger than stock, will crowd smaller boards and create memory install issues.

Other Thoughts: You can't beat it versus stock. No other 1156/1155 cooler I've used is as good for the money.

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  • Tom C.
  • 9/18/2011 8:22:57 AM
  • Ownership: 1 day to 1 week
  • Verified Owner

5 out of 5 eggsLow temps

Pros: Dropped my temps about 10 degrees. 33-38 idle and 50-60 with a load on, well within the rated temps for these processors.
Large and solidly built.
Same size footprint as the stock coolers, which I needed on my Sabertooth 55i. I had been running Zalman 9500s but had too much trouble installing on the 55i because of the interference with the heat sinks on the boards.

Cons: I found these a little difficult to install. It seems to take a lot of pressure to get the screws started into the brackets. I found that if you get the first screw started only give it a turn or two, just enough to keep it seated. Then do the diagonal screw and so forth and then tighten all four down. Not taking an egg off for this since the problem may have been my own fault and the coolers in the end do the job.

Other Thoughts: Bought two of these, one to replace a stock Intel cooler on an i7 875K and the other just to see if it did a better job than the Xerotherm cooler I had on an i5 750, ASUS p7p55E-LX. Replacing the stock cooler was of course the big improvement. I used Arctic Silver Ceramique for the i7, but on the i5 I just left the pre-applied compound on the cooler and so far have not detected any difference. Does about the same as the Xerotherm, except that the Dynatron keeps the temps cooler when the ambient temp goes up in the afternoon.

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

5 out of 5 eggsgood choice

Pros: Does a good job if you're not over clocking. Relatively quiet. Mounting is much better than the standard plastic push pins on most Intel heat sinks. Fits where a lot of other heat sinks won't.

Cons: For most computers you'll need to have the motherboard out, but that may be avoided if your case allows access to the underside of your board where your processor mounts.

Other Thoughts: If you're choosing between this and a Rosewill RCX-Z300, spend the extra twelve bucks and get this. I'd recommend you also visit Arctic Silver's site for instructions on application of thermal compound for your 775 processor for best results. This is cooling a Core 2 Quad (not over clocked) without issues using AC5 that was applied per the recommendations on the aforementioned site.

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

  • Anonymous
  • 3/15/2011 5:03:15 PM
  • Ownership: less than 1 day
  • Verified Owner

5 out of 5 eggsFAN-tastic

Pros: Easy to install. Copper core. Quiet fan. What's not to like. Got it to replace a K666 with a very whiney fan I just couldn't live with. Same back-side brackets as the K666, so I just left those in place. All is quiet on the HTS front now.
Ordered Sunday, shipped Monday, arrived and Installed today. NE ROCKS!

Cons: Just that I passed on this the first time around for the K666 because of the other reviews of it here.

Other Thoughts: If you take the paper off the metal backside brackets, they fit nicely against the long sides of the CPU socket on the back of the MB and the sticky stuff on them holds them in place. For more detailed install info, see my reviews of the K666 and the P985 for the 775 CPU.

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

  • son n.
  • 9/4/2010 1:47:00 AM
  • Ownership: 1 day to 1 week
  • Verified Owner

1 out of 5 eggsworse than the stock cooler

Pros: none

Cons: installing this fan is a mess. the harness for the back of the mobo is extremely difficult to install. this fan does not cool at all; i am only on firefox and its currently at 60c.

Other Thoughts: resembles the stock fan very much (ugly)

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

  • Jason K.
  • 9/2/2010 10:30:06 PM
  • Ownership: 1 day to 1 week
  • Verified Owner

3 out of 5 eggsOkay fan, annoying to set up

Pros: This is a low level fan that will probably beat out the stock fan that comes with your processor. It definitely gets the job done to some extent.

Cons: No instructions came with it. It was just the fan and 2 steel brackets that had a sticky side to them. I had to call their headquarters in California to get the instructions on how to install it. Even after I figured it out, it took another person and another hour to force the screws into their sockets. I don't recommend this and you should find something a little more simple to set up.

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

  • Monte C.
  • 8/1/2010 5:32:44 PM
  • Ownership: 1 day to 1 week
  • Verified Owner

4 out of 5 eggsAs expected

Pros: Big heatsink. Cooled the CPU better than stock, has a grill over the fan (works well for my ITX build. VRM.

Cons: It is not as quiet as I hoped. It is pretty good once the motherboard bios is set up, but it is not quieter than the stock fan.

Other Thoughts: The stock fan is just about as good as this one at least at stock settings. Still this is a nice big heatsink and it does have enough clearance to fit in my SG05. I still would have preferred a quieter (lower rpm) fan.

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

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