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Last reply by 07-21-2021 Solved
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XPS 8940, Better 3rd party cooler

Hello there

I would greatly appreciate any help to find a new/better 3rd party cooler for my XPS 8940. It came with the thin and small stock cooler and is overheating the whole time. I got a i9-10900 processor with 128 GB of RAM and I need this computer to generate some GIS layers. These jobs take 2-4 hrs every time and I can see that the processor is throttling or C° 97+ all the time.

I tried the Noctua 15S but the problem is there is no space for the bracket under the motherboard. The stock fan screws directly into the chassis from above.

Thank you very much

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Not applicable


. . . also the Noctua 92mm NF-A9 for the rear exhaust fan upgrade.


Thanks, but I am just trying to upgrade the existing cooler on a 65 watt 10700.



No Noctua is compatible with the LGA1200 of our Xps8940. There is a fixed 4 nut bracket fixed from behind the motherboard that is flush. This avoid the use of the noctua X bracket

The nuts thread is to narrow to use the bolts provided for the LGA22XX

The only solución to use a noctua is to cut the 4 nuts fixed to the Dell case


The original Dell studs are not compatible with any of Noctua models. The threads are narrower and you cannot use the bolts designed for the LGA22XX coming in the kit. The same studs don't allow to use the X bracket coming with your Noctua.

You need to cut the studs

Not applicable

@AntonioGPS     No Noctua is compatible with the LGA1200 of our Xps8940.


 The nuts thread is to narrow to use the bolts provided for the LGA22XX

M3 x 16  (see posts up-thread)


@brimstn What is the width of the m3x16 you used?  Like others have said, it has to be quite narrow.  I found the ones on the original cooler to be very narrow at the end (narrower than the bolt's shaft).  It looked lie a .3 to me but I am not certain.

Not applicable

@silentrob187    What is the width of the m3x16 you used?

3mm . . . by definition


Noctua NH-U9S Cooler - CONFIRMED FIT..!!


Hi all I just want to tell you from personal experience (because I just did it today), that the Noctua NH-U9s cooler DOES fit without modification.


Simply remove existing pancake cpu heatsink then fit the supplied Noctua curved mounting arms (not the angled AMD ones).

Make sure you use the longer WHITE spacers that come with Noctua cooler for this.

As mentioned earlier in this thread (or another) someone mentioned using M3 10mm screws but I don't believe that is accurate, I used 16mm M3 screws. I also used both M3 and M4 washers on each screw.


That's basically it, new cooler screwed right on with no issues. (don't forget your new thermal paste).

And that is with TWO (Noctua NF-A9) fans on the cooler.

I have 2 x 16GB Corsair Vengeance Dimms in mine with large heatsinks, and the new cooler with the extra fans easily clears the ram.

I also added another Noctua NF-A9 fan replacing the case exhaust fan.

Note**: I connected all the fans to motherboard but they seemed extremely slow, so I used the SATA power cable that others have mentioned, and the fans work great.


**OK so now the caveat....!!

Your mileage may vary, but as others have reported my BIOS did give an error at boot, because I had disconnected the fans from the motherboard.

So I simply reconnected them and tie-wrapped them in the case. Problem solved


I benchmarked the CPU with Cinebench and Prime95 before replacement and was easily hitting 95 degrees.

Which is just insane, I don't know how Dell has the nerve to sell this machine.


I retested after new cooler install, and I have not gone over 70 degrees during benchmarks.

That's a massive 25 degrees cooler...!!!

Not applicable


Great Job . . . great temps . . . great results!

Post some photos if you got them.




Picture uploaded as requested. 

You can see room for RAM and the provided WHITE spacers used on cooler mount.

I hope to get rid of original fans once I find a working fix for the BIOS complaining if they're removed. 

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