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?
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.
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 04:38 PM.