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Ryzen 3900x power cycle when running AVX workloads

 
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post #1 of 8 (permalink) Old 07-11-2019, 01:44 PM - Thread Starter
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Ryzen 3900x power cycle when running AVX workloads

I have been posting about this on Reddit and have decided to move this saga to a full thread. Hopefully this will lead to a solution and everyone else having issues can see this.

I waited on launch day to get my 3900x and an x570 Taichi motherboards. I then configured my rig as follows;

3900x
X570 taichi
4x8gb G.skill Flare X 3200cl14(running bios stock NO xmp)
2080ti FE with EVGA hybrid kit
Corsair H115i RGB Pro
1tb 970 Evo NVME, top slot
Seasonic X 750w (only the 8 pin CPU, the 4 pin is OTW)
Ryzen master for temps

The computer booted fine and passed userbench and some other light workloads. But upon running Prime 95 or cinabench, the entire system would power cycle. I then tried different voltages and overclocks as well as plenty of different ram speeds and timings. Nothing would work.

First HW change: I then took my CPU cooler off and saw that the thermal paste(AS5), rather than spreading to the entire CPU, had stayed relatively in the middle. I wiped it off, and reapplied. I then updated bios from 1.1 to 1.4. This configuration passed cinabench but could not do any CPU overclocking as a power cycle was imminent on any OC. I started paying attention to the CPU temps and noticed upon running P95 (the only one at this point unable to run without power cycle) the temps would immediately hit 95 degrees, while the AIO temps would rise by 4 or 5 degrees to 33/34. This concerned me as it seems that the h115i had a contact issue.

Second HW change. I then swapped the h115i out for the stock cooler, and now the stock settings will "pass" prime 95. Taking a straight edge to the 115i reveals some wobble, or bowing in the cold plate. But with the stock cooler, the temps still hit 95 immediately, but the clock throttles down to 3.9 GHz. My idle temps are around 40c with this setup.

Few questions/ things to consider
1. With the RMA of the cooler I will be able to find out if that was an issue, but has anyone with a corsair AIO run into this? And with the offset chiplets, are there certain brands that are better as cooling potential is not "focused" in the center?

2. Jayz2cents released a video about the stock bios's overvolting, what should I try to get better temps/ stability? Also did anyone have my issues and this is what fixed it?

3. Could there be a variance large enough in the solder where it does not have proper contact with the lid?

4. Could this be symptoms to other issues?

I will post again when I can either get the RMA'd cooler or get a new one with temps/other data.
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post #2 of 8 (permalink) Old 07-12-2019, 08:56 AM
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Did you use the H115i on a system before the 3900X? Hard to imagine the cooler is faulty if temps were solid on the other system.

Yes, manually set voltage and properly set LLC. Auto voltage and LLC at stock on my 9900K gives my CPU ~1.35v when it needs less than 1.15v.

If you get your AIO back and you have the same issue then you know either the solder is bad on your CPU or that the H115i isn't cut out for an off-set die. If the latter I'd imagine Corsair would have had day one parts that worked better for it.

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post #3 of 8 (permalink) Old 07-12-2019, 09:40 AM
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Could try shimming over the ccx with a layer or two of silver or copper leaf. There's been a lot of talk about mounting pressure potentially not being high on the edge of the IHS.
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post #4 of 8 (permalink) Old 07-12-2019, 10:44 AM
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You shouldn't be using Arctic Silver 5 if you can help it as it's electrically conductive. You're better off with Arctic MX-4 or a higher end paste such as Thermal Grizzly Kryonaut, Gelid GC extreme, Noctua NT-H2.

Anyway before RMA I would try to spread the paste out instead of using a pea in the middle. Likely your prior CPU made the Corsair cooler's surface changed.


The R9 3900X on AIOs is going to perform worse than R7 2700X did due to heat density per area and the CPU die placement.


P.S. new 1.60 BIOs is up https://www.asrock.com/mb/AMD/X570%20Taichi/#BIOS

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post #5 of 8 (permalink) Old 07-14-2019, 06:56 AM
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I've seen a lot of reports now of high temps and a lot are using expensive AIO's, meanwhile I'm here with my "budget" HSF and while idle is high this seems normal for Ryzen 3000 (used to seeing 20-30°C with 7700K); load temps are good. I didn't check my IHS for flatness but it's not uncommon for them to have high points toward the corners. The contact plate for mine and similar thermalrght coolers are ever so slightly convex which helps get around this somewhat. AIO coldpates are typically machined flat with the microfinned section centrally positioned.

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post #6 of 8 (permalink) Old 07-19-2019, 05:30 PM - Thread Starter
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Well I seem to have figured it out, it 100% was an overheat shutdown. I took out my CPU cooler, rigorously cleaned it, applied some thermal grizzly and now my prime95 temps are sitting around 85 tops.
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post #7 of 8 (permalink) Old 07-19-2019, 05:38 PM
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Prime95 SmallFFT and with AVX/AVX2 enabled throttles the 3900X hard, I'm seeing drops to 3800MHz and 80*C Tdie. When I run Aida64 FPU the clock remains at 4025-4125 but the temps jump to 91 occassionaly.

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Last edited by Martin778; 07-19-2019 at 05:41 PM.
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post #8 of 8 (permalink) Old 07-20-2019, 06:32 AM
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Quote: Originally Posted by Garrett4 View Post
Well I seem to have figured it out, it 100% was an overheat shutdown. I took out my CPU cooler, rigorously cleaned it, applied some thermal grizzly and now my prime95 temps are sitting around 85 tops.
Glad you got it sorted

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