Question HELP!!! i9-9900 seems to be running way too hot.

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Karadjgne

Titan
Herald
I'd recommend using either 26.6 or latest version of P95 small fft for thermal testing. However, if using the latest, make sure you check all 3 AVX boxes. AVX is an extremely brutal set of instructions when used, and at 100% cpu usage, the temp output is what you'd expect from the cpu at 130%. There's very little AVX used in games, even less AVX 2, and no AVX-512 that I know of. That's used in a very few seriously professional apps, but is included instructions in the cpu if it's needed. P95 happens to use it if you let it. Version 26.6 was the last version that didn't include AVX technologies, since 3rd gen and prior Intel didn't include the AVX instruction sets. Those weren't introduced until 4th gen, which became problematic with latest P95 that at the time didn't include OFF switches for the AVX.
 
Fingers crossed the mighty Noctua NH-D15 will do the job. A couple of things, even though the Fractal Design R6 is a great case, airflow is not it's strongest point. The Fractal Design Meshify S2 would have been the better bet for the 9900K, almost the same but the mesh panel helps a lot. Finally a 360mm AIO like the Corsair H150i Pro or similar would also do the job though I am betting the Noctua should handle the 9900K.
 
Sep 16, 2019
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Rumor has it the latest version is no longer the 110% overload as it once was, and is 'approved'., so the 'use V26.6 only' caveat is no longer needed...(I tested both and found them to give the same temps now at least with my 7700K)

The poor NH-U12S looked to be less than half the mass/fin surface area of the D15....just not enough for a 9900K.

Hope the next cooler fairs better!
Got both versions now and hope to test them this weekend. Thanks for the added info!
 
Sep 16, 2019
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Hey all.
So, some mixed news here.
Got the NH-D15 installed about 15 minutes ago. Started out by running AIDA64, which is what I've been using to monitor temps and test. Initial temps were good, but as soon as I started up the test, they jumped way up; not quite as high, but still upper 80s and some peaks into the mid 90s.
Decided to try Prime95 since everyone seems to recommend that. Just started that test and temps are better, but still climbing. Right now most cores are in the mid to upper 70s and some are peaking in the low 80s.
So, not sure if AIDA was part of the problem; still a little confused about the seemingly high temps, although just since I wrote the last 2 sentences we're back down to mid-70s averages.
This normal?
Any thoughts?
 

Phaaze88

Honorable
Herald
In AIDA64, did you have more than 1 test checked off? The more tests you have checked, the harder it's gonna smack the cpu.

Prime95:
-Which version did you run? For all past v26.6, did you disable all the AVX related options?
-Which test did you run? Small Fft? Large Fft? Blend?
 
Sep 16, 2019
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I felt like the heat sink was kinda tricky to get set and screwed down. I had to push the spring-tensioned screws down a bit to get them to marry with the mounting bracket. Once they were threaded, everything felt smooth, but that did seem a bit odd. This is my first build, so I'm not super familiar with how things should feel.
But, I couldn't really see how it would be possible for the cooler to somehow be mis-aligned. Everything has very little wiggle room.
 

Phaaze88

Honorable
Herald
I ran 26.6
Blend test
Blend runs all the tests one at a time and loops until you stop it. That's fine too.

In AIDA I had everything checked except local disks and gpu
Wayyy too much. Only needed the one for cpu.
Now you know not to do that one again.

I felt like the heat sink was kinda tricky to get set and screwed down. I had to push the spring-tensioned screws down a bit to get them to marry with the mounting bracket. Once they were threaded, everything felt smooth, but that did seem a bit odd. This is my first build, so I'm not super familiar with how things should feel.
But, I couldn't really see how it would be possible for the cooler to somehow be mis-aligned. Everything has very little wiggle room.
If you're sure you followed the instructions to a T. I have the D15S, and recall mounting it to be pretty easy. Definitely easier than mounting a Hyper 212 EVO or any of the push pin coolers.

Temps currently around 40. Been at idle for the last 15-20 minutes.
40C idle is fine. If you were idling around, say, 50C, then you'd have a problem.
7820X here, and it sits between 35 - 40C on idle.
 
Sep 16, 2019
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Ok, not sure what happened but things are much better.
I tried to set my Vcore lower (instead of auto). This resulted in the machine not posting. PANIC ensued.
I reset the CMOS and got everything back. Went into Bios and got my memory set correctly and adjusted my CPU fan curve to be a bit more aggressive (same as before).
Ran AIDA stress (CPU only) and max temps were in the mid-60s
Ran Prime95 stress (blend) and max temps were in the upper 50s-low 60s.
I'll let them go a bit longer, but it appears that there may have been something in the BIOS that was causing things to run too hot. I did try to overclock at some point, but I had thought I reset all my CPU stuff to auto. Maybe I missed something.
Anyway, as of right now things are looking much, much better.
 

Phaaze88

Honorable
Herald
There is a feature, if enabled, called All-core/Multi-core Enhancement that will run the cpu at maximum Turbo Boost clocks all the time. It adds unnecessary heat, as well as using more voltage than needed(even more heat).
 
Sep 16, 2019
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That could be it, although I remembered that being turned on by default when I first started tweaking cpu settings in order to over clock. Either way, I’ll check to see where it’s set now when this Puget Systems after effects benchmark finishes
 
Sep 16, 2019
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Well, that does appear to be the culprit. The default for "enhanced multi-core performance" is auto and not enabled.
Only problem is that in order to get things cooler I've taken a performance hit, albeit only in the benchmark test at this point. When I ran the test this morning I got a 947 out of 1000. AFter resetting BIOS and the multi-core back to auto, my score was 887. That's only a 6% drop in score, which isn't too bad I guess.
 
Sep 16, 2019
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I don't see a way for me to mark this as "Solved." I would certainly say that's the case.
Thanks for all of the help on this. As a novice builder it was really great to get quick information from people who know what they're doing. Thank you again. This isn't a gaming rig, but the means by which I provide for my family so getting this solved quickly was a major deal.

In other news, I've got a perfectly good 1 month old NH-12S for sale!
 

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