3900x & 3700x not compatible with some AIO's and air coolers due to chiplet locations? - Overclock.net - An Overclocking Community

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3900x & 3700x not compatible with some AIO's and air coolers due to chiplet locations?

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post #1 of 89 (permalink) Old 07-25-2019, 08:42 AM - Thread Starter
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3900x & 3700x not compatible with some AIO's and air coolers due to chiplet locations?

I have been reading around a bit and it seems that people are having issues with very high temps on the 3900x with many of the popular AIO coolers and air coolers. Even the Noctua NH-D15 and BeQuiet! Dark Rock Pro 4 have reports of temps over 90C on load. Someone on reddit mentioned it may be due to the fact that most of the cooler designs focus cooling on the center of the plate and due to the chiplet design of the 3900x being offset they don't effectively cool the chiplets. It seems like there may be quite a few coolers that are affected. I am wondering if there may be some new AIO and air cooler designs coming out that will get cooling over the entire chip or if there are any currently out there that are better at cooling across the plate than others. Thoughts?


EDIT:
Interesting update on something that I found... Looks like PBO is on by default on my board. Might be the reason for a lot of the high temperature reports.

I was messing around with the BIOS settings today. I have 4 options for PBO in the bios of my Aorus board. PBO Enabled, Disabled, automatic and manual. I was doing some of the OCCT Small data set, Cinnebench R20 and a H.264 encode to keep things consistent. Still using my Fuma 2 air cooler.

PBO on auto or enabled in the bios made zero difference for my cinnebench scores and my OCCT Temps. I got an average of 7080 in cinnebench R20 avg 3 runs with PBO enabled and PBO automatic. 81C max temp in cinnebench. Got 92C on OCCT small data set and my H.264 encode averaged 111.5fps.

Interestingly the results with PBO disabled in the bios were quite different temp wise but the scores were about the same
Cinnebench R20 avg 7011 max temp 74c
OCCT Small data set 79C
H.264 encode avg 109.5 fps

So for a marginal hit to performance I was able to drop 14c off of my stress test temps by just disabling PBO in the BIOS that was set to automatic by default.

EDIT 2
I couldn't replicate these results. Not sure what happened the first time. PBO disabled and PBO auto behave the same confirmed by GBT-MatthewH in another thread.

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Last edited by killeraxemannic; 07-27-2019 at 03:38 PM.
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post #2 of 89 (permalink) Old 07-25-2019, 08:46 AM
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I'm running the the coolermaster ML360R cooler with my 3900x and my cpu temp don't go above 50C full load.
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post #3 of 89 (permalink) Old 07-25-2019, 08:53 AM - Thread Starter
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Quote: Originally Posted by Dibiase View Post
I'm running the the coolermaster ML360R cooler with my 3900x and my cpu temp don't go above 50C full load.
That's interesting. In a reddit post I was reading someone said they were getting good temps with a CoolerMaster 240 AIO too.

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post #4 of 89 (permalink) Old 07-25-2019, 09:29 AM
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Quote: Originally Posted by killeraxemannic View Post
That's interesting. In a reddit post I was reading someone said they were getting good temps with a CoolerMaster 240 AIO too.
There is a whole bunch of data over here https://www.overclock.net/forum/10-a...nch-temps.html of people running cinnebench posting temps. They all seem pretty good. Most topping out in the 70 - 80 C range.
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post #5 of 89 (permalink) Old 07-25-2019, 09:57 AM
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Quote:
Thoughts?
Without specific numbers (can you point us to the place where "people are having issues with very high temps on the 3900x"?) it is difficult to come to a conclusion. But since my Dark Rock Pro 3 covers the IHS of my 3700x completely, there should be no issue because of the chiplets inside the IHS. At most there may be a 5K temperature difference compared to a monolithic die in the middle of the IHS (what with slight pressure changes, similar to delidded results). Getting 90°C on decent cooling system seems like a setup issue: early BIOS versions giving too much voltage, manual overclocking gone wrong, people building a new system and not removing the plastic sticker from the cooler, not enough thermal paste.
This isn't a TR4 situation, where the IHS was too large for common coolers and they couldn't cover the whole thing.

I have seen a thread (don't remember where), where people speculated about water cooler blocks and the size/placement of the fin area inside them not corresponding to the Ryzen 3000 chiplet locations and if getting larger fin areas would result in better cooling. I doubt this pretty much (unless sub 2K is considered "better" enough), since the heat transfer of copper is already pretty good.
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post #6 of 89 (permalink) Old 07-25-2019, 10:15 AM
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Quote: Originally Posted by Dibiase View Post
I'm running the the coolermaster ML360R cooler with my 3900x and my cpu temp don't go above 50C full load.
That's interesting, because that's physically impossible unless you have exotic cooling. Taking into account the thermal paste, IHS, solder and chiplet diffusion barrier for the areas of these chips (since the temperature sensor is embedded within the chip, Tdie), even an ideal cooler (ideal 25C coldplate that doesn't heat up) won't be able to cool this chip much below 70C at full 142W load. Even 65C would be a massive stretch. 50C is categorically out of the question.

Either you're not actually at full load (142W) or your temperature sensor is broken.
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post #7 of 89 (permalink) Old 07-25-2019, 10:22 AM - Thread Starter
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Since it's free and easy to download whats your OCCT small data set temp after 10 min?

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post #8 of 89 (permalink) Old 07-25-2019, 11:52 AM
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The issue is before the IHS and location of the CCDs. It’s more getting the heat out of the CCDs due to the power package and density that’s the issue.
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post #9 of 89 (permalink) Old 07-25-2019, 11:59 AM
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Using my setup below, and running Cinebench R15, I am getting:

Low: 41*c
High: 76*c

Also note, my NH15 only has one fan and sits in a hot room.

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post #10 of 89 (permalink) Old 07-25-2019, 12:29 PM
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Ryzen IHS is 37x37mm so as long as your CPU cooler isn't using some direct contact heatpipe solution where the heatpipes don't cover the entire outer sides of the IHS you should be fine (i.e. a 4x6mm heatpipe solution without a baseplate).


Heatpipes and vapor chambers actually transport heat faster than water due to phase change , it's just that 240,280, and 360mm high FPI aluminum radiators will have more surface area for the final thermal interface (the fins to the air).

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