Hello. I have a temp issue with my R7 3700x high temp underload and idle with Noctua NH D15s. idle is above 45C, and underload like running Aida64 default selected option stress test cause the temp is go above 85C on HWinfo64. Even playing PlanetSide 2 cause the CPU temp to 77C and slowly reaching to 80C. I did reapply thermal paste with 3 dots and check the mounting, and it seems fine to me. Ryzen Balance Power Plan selected.
ROG Strix X470F
R7 3700x
2x16GB G.Skill DDR4 3200MHz RGB
Corsair 750D with 2x 140mm fans intake front and 1x 140mm exhaust back
Ambient is 30C. Bring down ambient from 30C to 26C doesn't help the temp
Case off doesn't help either
This is something we have discussed quite a bit in this thread, but does seem to be a source of confusion. With AMDs 3000 series, the cores, were split out from the IO die into a single 74mm^2 chiplet (or two in the case of the 3900X and 3950X). In the 1000 and 2000 series, everything was contained in a single monolithic die of 213 mm^2.
TDP is a measure of the wattage a cooler would need to be able to dissipate from the processor. Noteably, the 3700X has a TDP that is 40% reduced compared to the 2700X. But, it as has a die area (for the components generating heat) that is reduced by 65% (213 to 74mm^2). These leads to an overall increase in heat density at the cores, leading to higher temperatures. Furthermore, because the surface area of the die is so small, there is less surface contacting the integrated heat spreader (IHS) so the heat is harder to get out.
That is why the temps area higher, you are putting less energy in, but that energy is confined to a smaller space. It is also why upgrading a cooler has less effect. Eventually, the rate at which the heat is transferred to the IHS is the rate limiting step, and adding a bigger better cooler with more heat dissipation accomplishes nothing. Ironically, the 3900X can actually have better thermal performance in this regard vs the 3700X. The 3900X has a 50% increase in heat generating cores, but they are divided into two chiplets, leading to a 100% increase in die area. So the overall heat density there is lower, and the cores have double the amount of surface area contacting the IHS.
At the end of the day, the 3700X out performs the 2700X while drawing significantly less power from the wall. Sure it gets hotter, but that is expected by AMD. Noctua even comments on it with their coolers.
Yes, if you want normal-people load temperature:
This is with using the Ryzen Balanced power plan. The processors don't go by the complete 'minimum processor state' in the power profiles like Zen and Zen + did. Even if you set that to 100% it will use the microcode programmed C6 sleep state all the way down to 0%. Ryzen Balanced power plan has a minumum state of 99%, and ryzen high performance plan has a minimum state of 100%. Both of them will idle.
If lowering of ambient temp isnt helping your idle temp, then I think your case isn't being very efficient with airflow overall, or your fans are running too slow or are off at idle temps. Colder air across that cooler should be resulting in cooler idle temperatures, and somewhat help load temperatures. Yours is actually doing well enough since its keeping that 81c at 90w power draw. Its not throttling in that instance. But, thats the kind of temperature you can expect from an air cooler.
FYI, my ambient is around 15c.
I bet it does, because of some default options are what the 'Normal user' isn't going to be using:
When I said normal user load, I meant without AVX. I can run prime 95 w/AVX and it will be automatically hotter than Prime 95 w/o AVX, but thats something meaningless to care IMO. Its not something to Gage normal user or gaming stability with.
Realbench uses handbrake, and my temps are better in handbrake than yours because both my cooler and ambient is better. Prime95 w avx thanks to greatly relaxed limits will push it to ~84c, but for me thats with 150a and 230w of power, which is far more than your 90w.
like I said, your temps are what you can expect with the air cooler.
For a 90w comparison for air cooling vs water cooling:
There are tons of people experience 3700x high temp like these threads
The temps are really high with 3700x
3700X + NH D15 high temps | AnandTech Forums: Technology, Hardware, Software, and Deals
https://www.overclock.net/forum/10-amd-cpus/1731664-ryzen-7-3700x-very-very-high-temps.html
https://www.reddit.com/r/Amd/comments/cbc1eu/hi_folk_what_is_your_3700x_idle_temp/
I think, what we are learning from all of this is that everything that use to apply to previous Ryzen CPUs doesn't apply to Zen 2. AMD has been pretty bad about communicating what the differences are and what we should expect to see change. Here is a post I mentioned earlier, from another user, using the identical cooler you are using with an 3900X.
What is interesting about that result, is he achieved a Cinebench R20 multicore score of 7360 on the Noctua 15. That is within 3% of the multicore score I see on the identical chip with a custom loop. He also mentions his temps are below 80C under that load. So from this, we know that the cooler you have is more than adequate for a 105W TDP processor.
Seemingly paradoxically, yourself and a lot of others, are running the 3700X (a 65W TDP processor) and seeing much higher temps with the same cooler. The issue, seems to be related to the thermal density on the cores. The 3700X has 8 cores and allows 88W of package power (PPT) as a 65W TDP processor, for 11W per core. The 3900X however has 12 cores, and as a 105W TDP processor allows a 144W PPT or 12W per core. In the 3700X, all 88W are encased in a single 74mm^2 chiplet, while in the 3900X there are two 74mm^2 chiplets with six cores apiece. Each chiplet then, has a maximum (at stock) of 72W in it. So while the 3900X produces more heat overall that a cooler needs to disipate, it's energy density on the cores is lower than the 3700X. Because of that, it may well exhibit better thermal performance than the 3700X under the same cooler despite being a 105W part vs a 65W part.
The only way then, to know what is "normal" for your setup is for someone else to replicate it. As I mentioned, I do have that cooler in my server computer, and I'll try to make it over to the store today and grab a 3700X to put under it.
