Ryzen 9 3900X @ 97C

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Re: Ryzen 9 3900X @ 97C

Postby MeeLee » Mon Apr 27, 2020 2:27 pm

On my 3950x I had to do a bios upgrade. It readjusted the voltages on auto overclock. After this, I saw a 10c drop on air. The $75 Closed loop water-cooling system from cooler-master really works wonders in getting the temps down even further, allowing it to keep boost speeds much longer!
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Re: Ryzen 9 3900X @ 97C

Postby Kebast » Mon Apr 27, 2020 3:48 pm

MeeLee wrote:On my 3950x I had to do a bios upgrade. It readjusted the voltages on auto overclock. After this, I saw a 10c drop on air. The $75 Closed loop water-cooling system from cooler-master really works wonders in getting the temps down even further, allowing it to keep boost speeds much longer!


This one?
https://www.newegg.com/cooler-master-li ... 6835103297
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Re: Ryzen 9 3900X @ 97C

Postby puuteknikko » Mon Apr 27, 2020 3:49 pm

As I wrote in another thread, one option to try OC'ing a 3900X is to go to BIOS, disable PBO and any automatic overclocking. Set multiplier to 40x and core voltage to 1.2V. Stress test. In case of problems, lower the multiplier by 0.5X
A large percentage of 3900X will work well with such settings, to go higher, you need a lot more voltage and it will produce more heat (and eat more electricity).

Someone once said that 3900X is a two-chiplet CPU which has one chiplet and one shitlet :D That's why it really won't OC well.

And always, the latest BIOS and latest AMD drivers, enable AMD Balanced power plan if you run Windows 10.
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Re: Ryzen 9 3900X @ 97C

Postby gordonbb » Sun May 03, 2020 9:21 pm

I'm running a 3900x under Ubuntu 18.04.4 and run 21 threads CPU folding with 2 threads for 2 NVidia GPUs. I'm currently running Rosetta on 21 threads now but the load should be similar.

With a NH-D15 with both fans and stock settings in a Fractal Meshify S2 I'm seeing:
Code: Select all
root@fold7:~/projects# sensors
it8792-isa-0a60
Adapter: ISA adapter
CPU Vcore:      +1.28 V  (min =  +0.00 V, max =  +3.06 V)
CPU fan:       1448 RPM  (min =    0 RPM)
CPU_Opt_Fan:   1461 RPM  (min =    0 RPM)
CPU Temp:       +85.0°C  (low  = +127.0°C, high = +127.0°C)  sensor = AMD AMDSI
VRM_MOS Temp:   +60.0°C  (low  =  +0.0°C, high = -125.0°C)  sensor = thermistor

k10temp-pci-00c3
Adapter: PCI adapter
Tdie:         +85.2°C  (high = +70.0°C)
Tctl:         +85.2°C
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Re: Ryzen 9 3900X @ 97C

Postby skydivingcatfan » Sun May 03, 2020 10:00 pm

Running 21 threads on mine room temp 71 F NH-D15 cooler



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Re: Ryzen 9 3900X @ 97C

Postby holstien » Tue May 05, 2020 6:50 pm

I run my 3900x bone stock with PBO off using a Sythe Ninja 5 and case with lots of big slow fans and a rx 560. My office doesn't have good climate control, so it can get pretty warm before I stop folding for my own comfort. With 23 threads folding (1 set aside for GPU folding) I get T-die around 75-85, CPU package of 50-65. It seems like the Asus bios is using T-package to set the fan speeds: I set everything to max at 75C, but there isn't much control available before 55C, so I run the fans as slow as they'll go until then.

My friend has the same cpu and cooler in a case that has two big GPUs and worse airflow, and his temps are in the 80's and 90's. His temps drop by about 10C if he pulls the case cover off. He used the stock Wraith Spire Cooler with the speed switch set to high, and the noise was driving him batty. The Ninja didn't yield a huge improvement in temperatures, but it's much quieter.

This is kind of a flaw in the ATX design: cases tend to be designed to vent from the top/back, but if there are a bunch of hardworking components, then the CPU is trying to cool itself with air that has already been through a few gpus, so there's the heat from 300W of gpu work there already. It's very hard to thermally isolate the parts.
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Re: Ryzen 9 3900X @ 97C

Postby PantherX » Wed May 06, 2020 5:46 am

holstien wrote:...This is kind of a flaw in the ATX design: cases tend to be designed to vent from the top/back, but if there are a bunch of hardworking components, then the CPU is trying to cool itself with air that has already been through a few gpus, so there's the heat from 300W of gpu work there already. It's very hard to thermally isolate the parts.

I understand your point but would suggest that people who invest into a multi-GPU system may want to research into this matter a bit more if they are not already familiar with it options. You get blower-style GPUs where the heat is dumped out of the chassis. You also get other GPUs which dumps heat into the chassis. You get chassis with high airflow and you also get chassis where the motherboard is rotated by 90 degrees to allow a "chimney" effect where the cool air is sucked from the bottom and exhausted out of the top.
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Re: Ryzen 9 3900X @ 97C

Postby HaloJones » Wed May 06, 2020 4:53 pm

To be fair, the ATX case specification has been in use now for a very long time and it really hasn't changed much other than moving the PSU from the top back to the bottom back.

There have been big advances in cooling with all-in-one (AIO) closed-loop-cooling (CLC) being very easy to fit to cpus. It's in gpus that there has really been very little advance made. For those who want to try advanced gpu cooling, research the NZXT G12 adapter which allows the fitting of certain AIO/CLC coolers.

Or if you want to get really funky, do some research into custom water-cooling which is a whole other hobby to get obsessive over.
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Re: Ryzen 9 3900X @ 97C

Postby MeeLee » Wed May 06, 2020 5:19 pm

With Corona there's currently a shortage on hardware, thus the prices of some items have doubled in the last month.
THe $75 water cooler I purchased, now is online from $124 or up.
You can always buy an aftermarket one, that's in the same price category.
or, go air cooling.
Everything has gone up in price.
Air coolers like these $30 ones have about the same cooling capabilities as the stock cooler on a 3900x:
https://www.amazon.com/DEEPCOOL-GAMMAXX ... 00JQ2YDCY/

coolers like these do offer nearly same cooling capabilities as water cooling systems, but they also cost about the same:

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Re: Ryzen 9 3900X @ 97C

Postby gordonbb » Wed May 06, 2020 6:03 pm

HaloJones wrote:To be fair, the ATX case specification has been in use now for a very long time and it really hasn't changed much other than moving the PSU from the top back to the bottom back.

There have been big advances in cooling with all-in-one (AIO) closed-loop-cooling (CLC) being very easy to fit to cpus. It's in gpus that there has really been very little advance made. For those who want to try advanced gpu cooling, research the NZXT G12 adapter which allows the fitting of certain AIO/CLC coolers.

Or if you want to get really funky, do some research into custom water-cooling which is a whole other hobby to get obsessive over.

Or take the middle ground and consider replacing one of the 2 GPUs in a dual-GPU system with a Hybrid card that comes with an AIO installed from the factory. Usually less cost than trying to retro-fit one later. I usually install the hybrid card as the lower card as it seems to work better that way.

EVGA also sells hybrid kits to adapt certain of their GPUs.
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Re: Ryzen 9 3900X @ 97C

Postby HaloJones » Wed May 06, 2020 6:21 pm

It's a funny old thing, cooling.

This is being written on a machine with a 1070 and full custom water-cooling. There's a fullcover block on the card, a 360mmx60mm thick radiator with three 120mm fans and a D5 pump/reservoir and the card is at 2062MHz and 44C.

In the same room is another machine with a 1070, a NZXT G10 with a 280mm AIO and two 140mm fans. It's running at 2075MHz and 36C. 8C lower with cheapass second-hand cooling.

You can't always predict how things will turn out.
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Re: Ryzen 9 3900X @ 97C

Postby jrweiss » Wed May 06, 2020 7:05 pm

PantherX wrote:I understand your point but would suggest that people who invest into a multi-GPU system may want to research into this matter a bit more if they are not already familiar with it options. You get blower-style GPUs where the heat is dumped out of the chassis. You also get other GPUs which dumps heat into the chassis. You get chassis with high airflow and you also get chassis where the motherboard is rotated by 90 degrees to allow a "chimney" effect where the cool air is sucked from the bottom and exhausted out of the top.

Many/most "blower-style GPUs" dump only a small fraction of the hot air through their own backplanes. Most of the hot air gets dumped into the chassis. One helpful hint is to ensure the backplane covers on either side of the GPU are also slotted instead of solid, promoting hot air flow directly out the backplane, especially if the front intake fans blow directly across the GPU. It is also helpful in this case to ensure positive pressure - more intake than exhaust fans. Don't forget to factor in the fan in the PSU as well.
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Re: Ryzen 9 3900X @ 97C

Postby BlueTurtle » Wed May 06, 2020 10:08 pm

I was having the same problem with my Ryzen 9 3900x on an air cooler with a single fan (be quiet! Shadow Rock TF 2), hitting above 90C after some minutes running F@H even while I have only assigned 8c(16t) of my 12c(24t) CPU to it.

I have solved the temperature problem, by lowering the Platform Thermal Throttle Limit to 85C or even 80C (AMD standard is 95C I believe) in the BIOS. This had only a very small impact on my cinebench R20 score.

On my Asus motherboard the Platform Thermal Throttle Limit setting is to be found under Precision Boost Overdrive, while it's technically not a part of Precision Boost Overdrive to my understanding. This new termal limits works for me, while I did not turn on PBO. Now my CPU will never rise above the new thermal limit.

I not an expert on these kind of bios settings, and could not find any additional information about possible side effects of the new thermal limit I set.
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Re: Ryzen 9 3900X @ 97C

Postby pcwolf » Wed May 06, 2020 11:37 pm

Two things:

1) Even with Ryzen 3950X my CPU PPD are a tiny fraction of what I contribute to F@H using my GPU.

2) My experience with both F@H and WCG, setting the motherboard UEFI for "ECO" mode easily cuts temps 20 degrees, with no noticeable loss of PPD
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Re: Ryzen 9 3900X @ 97C

Postby Nathan_P » Thu May 07, 2020 1:58 pm

Eco mode drops the TDP by 1 tier, so your 105w 3950x drops to 95w. It does thi by lowering voltage and clocks if needed.
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