Ryzen 9 3900X Temperatures

[Euphonium]

I've recently built myself a new Ryzen 3900X system. I'm using the stock cooler (wraith prism) and a Fractal Design Define 7 case with 2x 140mm intake fans.
For a lot of years I've used CoreTemp to keep an eye on my CPU temps, but I found that on this build it reports idle temperatures of 60-65'C which seems very high.
I tried the Ryzen Master software and it reports idle temps of 45-50'C, which still seems a little high in room temperatures of ~20'C

Under heavy load, such as encoding with Handbrake or Folding@home, my CPU temps almost immediatly jump to 95'C and the CPU quickly backs off from 4.0-4.1GHz to 3.775-3.8GHz

Can I safely assume Ryzen Master is the more accurate number or should I be using something else for measuring CPU temps?

Is this the best I can expect from the stock cooler? I've been reading the Hexus cooler reviews recently and they get much better temps, but none of them have and stock cooler figures for comparison.

It's been 8 years since I last had to tweak cooling & fans so I'm interested in any advice on how to improve cooling with what I've got before I look into spending more on an aftermarket solution.

[Xlucine]

Zen2 stays fairly warm under light load, getting a reported 60-65C from monitoring tools is normal. I'm not sure why ryzen master gives a lower value - I can't get it to work on my system, so haven't really played with it.

Backing off the frequency as it heats up is expected and normal, but the load temp of 95 seems a bit high - my 3700X (so 20% less cores) was easily kept below 90 with the wraith prism (85 C at 100% fan speed). Are you using a default fan profile? It might benefit from some adjustment to up the fan speed at higher temperatures

[DanceswithUnix]

My only experience of big Ryzen chips is on integrated water setups where they top out at about 60 degrees. But they are supposed to have a maximum temperature of 75C, so 90 sounds like the reading is wrong.

Do you have any overclocking settings on? Switching on PBO would bump the temperatures up a lot, but even then not at idle.

What does the BIOS hardware monitor page say? The CPU is actually pointlessly busy when in the BIOS so that isn't at idle so would be a good sanity check.

Have you checked your heatsink is making proper contact with the CPU?

[Jonj1611]

Max temp of the 3800X is 95 degrees and so is the Ryzen 9 3900X -

https://www.amd.com/en/products/cpu/amd-ryzen-9-3900x

[Euphonium]

Are you using a default fan profile? It might benefit from some adjustment to up the fan speed at higher temperatures

I tweaked the fan profiles for both the CPU cooler and case fans to hit 100% when the CPU reached 70'C.

Do you have any overclocking settings on? Switching on PBO would bump the temperatures up a lot, but even then not at idle.

I don't have any overclocking settings on.

What does the BIOS hardware monitor page say? The CPU is actually pointlessly busy when in the BIOS so that isn't at idle so would be a good sanity check.

In the BIOS CPU and system temps are 41-42'C
BIOS says CPU core voltage is 1.478V which seems high, but the voltage setting is "Auto"

Have you checked your heatsink is making proper contact with the CPU?

I'm not sure how to check that unless I remove the heatsink & try again. I think I'll need some fresh thermal paste before I try that?

[kalniel]

In the BIOS CPU and system temps are 41-42'C
BIOS says CPU core voltage is 1.478V which seems high, but the voltage setting is "Auto"

Auto usually means the motherboard will overvolt as speed increases - it might be applying some kind of 'optimisation' in the BIOS which results in the motherboard setting higher voltages. Try changing it from auto to something like 'normal' instead.

[Euphonium]

Tried to add screenshots showing temps at idle & under load but they didn't seem to appear.

[Euphonium]

BIOS CPU voltage options are Auto, Override, Offset, Override+Offset, and AMD Overclocking.

Looking more closely, the voltage actually drops from 1.45 at idle to 1.25-1.35 under load

[Helios451]

I have a Ryzen 9 3900X on a Auros Master mobo, with a be quiet! Dark Pro 4 air cooler. It tends to vary between 35 and 50 at idle and on light loads (at present with two browsers open and a YouTube video running it's around 40). Occasionally it hits 90 when really, really pushed. I have also optimised the airflow inside the case to increase cooling efficiency, which I think helps.

[philehidiot]

Those BIOS core voltages are insane. I don't quite know how it happened but in the early revisions, the BIOSes of most boards were defaulting and autoing VCore majorly high. I had this problem and it took a BIOS update, followed by a BIOS reset to resolve the issue.

https://youtu.be/Ssuqhyqah2k?t=228

I would update your BIOS and perform a complete reset of it after the update has been applied.

I would not use any overclocking (except setting the RAM to run at proper frequencies and timings as per XMP).

I would auto everything with the latest BIOS and look at what the actual outputs are set to in the EFI or using Ryzen Master. I would then compare them to the video I posted above and manually set them only if required.

One of my issues was that cores were not sleeping, so in Ryzen Master all the cores were on all the time. I didn't even realise they should sleep until they started doing so when I fumbled the above fix.

I did the above with the same issues (although my temps didn't go so high due to watercooling running at max chooch and the PC beginning to hover around the room) and now it runs way cooler, idling around 30C and peaking / plateauing around 75C with all cores fully loaded.

My motherboard is an X570 Aorus Elite, so likely shares issues. My CPU is the same as yours.

EDIT: In the video, he's using an Asus board and some of the settings are named different to Gigabyte.

EDIT EDIT: Their smart fan was a nightmare for me as well. I turned off all the smart fan stuff. I am on fixed mode with the fans being at the fastest I can deal with without the noise bothering me (40% of max RPM), up until 70C where they ramp up full. This tends to only cause full fan chooch in gaming, the rest of the time it is fairly quiet. I'm using a 6 year old AIO watercooler and I am using one of those TIM strips rather than paste as an experiment. I bought both and installed it with the strip to see what happened, expecting to have to resort to paste but I must say, I'm very impressed. I am expecting to have to replace my cooling soon due to age and that will make it a lot easier.

[Euphonium]

I'm running the latest non-beta BIOS.

Taking the heatsink off and reseating it has brought the idle temperatures down by 2-3'C but makes no difference under load.

[watercooled]

Jumping immediately into the 90's suggests it's not something like fan speed, rather something up with the thermal path between CPU and heatsink, or something wrong with voltages. When you say 'almost imemdiately', how quickly are we talking exactly? E.g. does the temp shoot up the instant load is applied or does it take tens of seconds?

DanceswithUnix mentioned this earlier but is PBO, Precision Boost Overdrive, definitely off in BIOS? Not to be confused with Precision Boost, mind. Confusingly, they're two different options.

Regarding measurements, Ryzen Master will be more accurate. Last I checked (which was admittedly a while ago) CoreTemp was an Intel-focused utility which hadn't been updated in ages, and an offset needs to be applied to the raw readings from Ryzen CPUs.

And one last thing, what power profile are you running in Windows?

[Euphonium]

Jumping immediately into the 90's suggests it's not something like fan speed, rather something up with the thermal path between CPU and heatsink, or something wrong with voltages. When you say 'almost imemdiately', how quickly are we talking exactly? E.g. does the temp shoot up the instant load is applied or does it take tens of seconds?

Right now as I type this the only load on the system is my browser (Firefox), Ryzen Master, and MSi Afterburner for monitoring my GPU.
Ryzen Master says my CPU is at 56-57'C, 1.2-1.5GHz, CPU Power 18-20W, SOC power ~16-17W. Peak core voltage is jumping between 1.2V and 1.3V
MSI Afterburner says that the CPU is drawing ~47-50W and the GPU is at 49'C and 46% load

Loading the CPU only with Folding@Home, CPU temp jumps 65,84,92'C in about 3 seconds then steadies down at 95'C and 3.85GHz by 10 seconds. This is with the side of the case open to try & separate out CPU behaviour from case ventilation.
Ryzen Master says PPT = 83% of 142W, CPU power 88-90W, SOC power 18W, TDC 79% or 95A, EDC 93% of 140A, peak & average voltage both 1.2V

DanceswithUnix mentioned this earlier but is PBO, Precision Boost Overdrive, definitely off in BIOS? Not to be confused with Precision Boost, mind. Confusingly, they're two different options.

I *think* PBO is off in BIOS. I set everything back to defaults then enabled XMP for RAM and tweaked the fan curves abit but didn't touch anything else.

Regarding measurements, Ryzen Master will be more accurate. Last I checked (which was admittedly a while ago) CoreTemp was an Intel-focused utility which hadn't been updated in ages, and an offset needs to be applied to the raw readings from Ryzen CPUs.

Thanks

And one last thing, what power profile are you running in Windows?

Control panel says AMD Ryzen Balanced

[watercooled]

OK so the temperature ramping that quickly does sound suspicious. Is it definitely mounted correctly? No labels left on thermal compound etc? Sorry if that sounds patronising, but worth checking as it does sound something like that could be causing the problem. Something isn't right with the thermal path.

[Euphonium]

OK so the temperature ramping that quickly does sound suspicious. Is it definitely mounted correctly? No labels left on thermal compound etc? Sorry if that sounds patronising, but worth checking as it does sound something like that could be causing the problem. Something isn't right with the thermal path.

There were no stickers on the top of the CPU and I definitely took the plastic cover off the base of the heatsink

I found half a tube of Arctic MX-4 that I'd forgotten about so I'm going to try cleaning the CPU & heatsink and applying fresh compound later tonight.

I'm also going to have a look at aftermarket coolers and some extra case fans.

[watercooled]

I'm not sure how much difference an aftermarket cooler would make if the stock cooler hasn't even had time to get warm. As for case fans, they're not where you should be looking for a CPU that's getting hot before the air temperature inside the case has increased.

Something doesn't sound right TBH, from the reviews I've seen online and the experience of friends who have ran the same CPU with stock cooler, it doesn't seem like load temps should be shooting up like that.

It could also be an incorrect temperature reading but the dropped clock suggest otherwise.

What BIOS version are you on?