PC with Ryzen 7950x shuts down when using Progressive rendering or IPR

[Joelaff]

Yup, MemTest will detect issues in the first hour usually, this rules out the memory
It is either a faulty CPU or MOBO, let us know how this goes

Until I updated the BIOS I was getting a pass from memtest x86, and failures from Prime95. Prime95 was correct of course. I find Memtest does not stress the system enough to catch all errors. It's a good first test, though.

[dean_dmoo]

Sounds like an issue I had about 18 months ago (3790x). With Muhammed's help it was because of the motherboard. Lowering the chip speed in the bios made it stable to render on, but the issue was the MB not being powerfull enough and/or faulty.

Admittedly because of work deadlines I havent even gotten round to replacing it yet and its been stable at the lower speed which I think was about 10% lower than the max it can do.

[Joelaff]

Sounds like an issue I had about 18 months ago (3790x). With Muhammed's help it was because of the motherboard. Lowering the chip speed in the bios made it stable to render on, but the issue was the MB not being powerfull enough and/or faulty.

Admittedly because of work deadlines I havent even gotten round to replacing it yet and its been stable at the lower speed which I think was about 10% lower than the max it can do.

If it work at the stock BIOS settings then it is likely not the motherboard being "faulty." It may not overclock as well as others, but every part has design specs it must meet (including CPus, etc.), and if it works at default "optimized BIOS settings" then it meets spec. Overclocking (which includes things like using EXPO, etc.) is uncharted territory, and never guaranteed to work. It's nice when it does and you can get another 5-20% or whatever. Of course, you may still want to swap it for a mobo that will work. I have had so many machines that are not stable at higher than stock RAM speeds over the years, every type and brand of mobo. I just turn it down until it is and live with it. I am sure many times it is the RAM as well. Also, the number and placement of the DIMMs can make a difference too.

You would be surprised how many system people *think* are stable are not if you push them to the limits. Each program stresses things differently, and at the end of the day all that matters is if your particular load is stable. Until a cosmic ray hits your RAM a flips a bit... (And the "ECC" in DDR5 is not true ECC )

[dean_dmoo]

Sorry, with max I meant max speed at stock settings. It was set to optimised bios settings and it would crash the pc.

[Joelaff]

Sorry, with max I meant max speed at stock settings. It was set to optimised bios settings and it would crash the pc.

Ah.. Well THAT I would call faulty

[Alex_M]

When I started building all of our 7950x nodes I ran into memory test errors until I updated the BIOS. With a new platform the BIOS updates have big fixes. You might try that.

Then try lowering the RAM frequency, as others have suggested above. Get it stable with the default BIOS settings (after updating the BIOS) first. Then you can play with EXPO, but there is no guarantee that the EXPO settings will be stable. Hence why you try lowering the frequency (first down to the stock RAM setting (usually 4800)).

If you want to test faster than render try Prime95. It was giving me the RAM errors pretty quickly.

Hi Joelaff,
Thanks for the tips. As already mentioned, I tried the latest BIOS, and running the memory at the lowest speed - DDR5 2000 but it didn't help. I get black screens within seconds in Corona benchmark and Prime95 Large FFTs.

[Joelaff]

Hi Joelaff,
Thanks for the tips. As already mentioned, I tried the latest BIOS, and running the memory at the lowest speed - DDR5 2000 but it didn't help. I get black screens within seconds in Corona benchmark and Prime95 Large FFTs.

Oh, sorry I missed that part. That sounds bad

If it is failing with default BIOS settings and decent temps (at idle, it will go to 95deg C for rendering if it has to, and then thermal throttle... this is by design-- you are not hurting it letting it get to 95C, but you may be getting lower performance) then I would say it's either bad RAM or a bad MOBO. I would take out all but one RAM stick and see if the problem persists. If it DOES persist, then swap that RAM stick for another. If it STILL persists then I would look at another mobo.

We have Asus, Gigabyte, and Asrock Mobos (availability issues at the local store). So far the Gigabytes have had the fewest issues and been the easiest to tweak.

[Morbid Angel]

Alex, what about your video card? what video card is it? I remember in one of my systems I did not fully connect one of the 4 pins for the power and it would work, but not when video card was stressed it blacked out the screens and bsod the machine. If you tried swapping the power supply, maybe try reseat or swap video card as well?

[Alex_M]

I've already tried taking out the graphics card and using only the integrated GPU in the processor and I still get the problem. Besides, the problem happens when I stress the CPU, not the GPU. I also tried Windows 11 and this didn't help either - still black screens under CPU load.

[Morbid Angel]

Replace the mobo, and cpu if you can one by one. Its last thing I can think of.

[Alex_M]

A person on Reddit said that he knows a tech Youtuber who shared that Gigabyte have been producing faulty B650E motherboards that can't handle AVX workloads. Looks like I was one of the unlucky ones who got one of those faulty Gigabyte boards. I will RMA the motherboard and see what happens. What sucks is I have to wait a whole month before I get a new/fixed motherboard back. It doesn't do Gigabyte a lot of favours hiding this issue and not quickly and proactively replacing affected people's motherboards

[Joelaff]

No problems with Gigabyte X670E's here. Sucks about their B650s if that's the case.

[Alex_M]

I bought another motherboard - ASUS ROG Crosshair X670E Hero and it works flawlessly! No black screens and system hanging anymore. The Gigabyte motherboard was indeed defective.