Unstable Ryzen 7950X

[tuckerkao]

Looks like Prime95 30.8.17 doesn't support AMD Ryzen 7950X on Windows 10 either. Is there a correct version of Prime95 I can download?

[S485122]

Originally Posted by tuckerkao

Looks like Prime95 30.8.17 doesn't support AMD Ryzen 7950X on Windows 10 either. Is there a correct version of Prime95 I can download?

If you stated the errors you get with all parameters and symptoms you might expect an answer.
You mentioned several problems :

Originally Posted by tuckerkao

I'm wondering when Prime95 30.9 will start to run smoothly with Ryzen i9 7950X on Windows 11. The 30.8.17 version kept getting the FFT errors during the PRP testing or even roundoffs during P-1. System virtual memory and page size already increased to 17 GBs ~ 25 GBs.

This would point to an unstable configuration. Did you try to run Torture Tests ? With what results for which settings ?

[James Heinrich]

Originally Posted by tuckerkao

Ryzen i9 7950X on Windows 11. The 30.8.17 version kept getting the FFT errors during the PRP testing or even roundoffs during P-1.

Originally Posted by tuckerkao

Looks like Prime95 30.8.17 doesn't support AMD Ryzen 7950X on Windows 10 either.

Prime95 v30.8b17 is running just fine on my 7950X on Windows 11...

[James Heinrich]

Originally Posted by James Heinrich

Prime95 v30.8b17 is running just fine on my 7950X on Windows 11...

That said, I notice sometimes the threads are all nicely spaced onto presumably real cores, other times it all seems out of whack. Should I be concerned?

[kruoli]

Do you see a performance difference in the two cases you have presented?

[tuckerkao]

Originally Posted by S485122

If you stated the errors you get with all parameters and symptoms you might expect an answer.

The exponent size may be the problem that cause the error. I'll just post a screenshot(#1), see if George Woltman has the solution (CPU: AMD Ryzen 7950X, Windows 10).

This error doesn't occur every time, but most likely will occur after half an hour of continuous test.

The same problem also arises during the PRP test with the FFP, but that can cause bluescreen death for the Windows system at times.


When I bring the P-1 file to the other computer that works good(Intel CPU), the auto FMA3 FFT selection seems to be much larger, but I don't know how to adjust that on individual machines(Screenshot #2).

[James Heinrich]

Originally Posted by tuckerkao

The exponent size may be the problem that cause the error.

Works fine on mine. Same FFT size is selected. My selected bounds are higher, but it looks like you hardcoded bounds rather than let Prime95 select them?
Also, you seem to be running only 1 worker with 8 threads so only using half the CPU?
And finally, again, you're working on unreserved exponents. Please reserve the exponents you work on.

[James Heinrich]

Originally Posted by kruoli

Do you see a performance difference in the two cases you have presented?

Of course after posting that it's been showing up very consistently in the "sane" configuration, I don't know I got it scrambled like that before.

[tuckerkao]

Originally Posted by James Heinrich

Works fine on mine. Same FFT size is selected. My selected bounds are higher, but it looks like you hardcoded bounds rather than let Prime95 select them?
Also, you seem to be running only 1 worker with 8 threads so only using half the CPU?
And finally, again, you're working on unreserved exponents. Please reserve the exponents you work on.

I couldn't reserve the Pminus1= code assignments for some reason, the worktodo.txt always change to N/A afterwards. Invalid assignment type error message.

I've noticed that the Gerbicz errors occur even Prime95 checks them every 10,000 iterations on Ryzen 7950X, perhaps some adjustments needed for the BIOS or power or memory settings?

[James Heinrich]

Originally Posted by tuckerkao

I couldn't reserve the Pminus1= code assignments for some reason, the worktodo.txt always change to N/A afterwards.

If you look at the top Communications window in Prime95 it should give you a reason for the failure-to-register.
Any particular reason why you're hardcoding bounds with Pminus1= rather than letting Prime95 decide with Pfactor=1,2,168455141,-1,77,1.3?

[tuckerkao]

I checked the memory allocation graph from Task Manager.

When Prime95 is running the stage 1 of P-1 or PRP test on my Ryzen 7950X machine, it only used 0.3 Gb of RAM for some reason, that was why the errors keep occur, how can I change this?

Prime95 displayed Out of Memory! and stopped P-1 after stage 1.

I noticed that stage 2 of P-1 doesn't have this problem if stage 1 finished on another machine because there's a menu in Prime95 that I can adjust the RAM usage.

Originally Posted by James Heinrich

Also, you seem to be running only 1 worker with 8 threads so only using half the CPU?

I tried to find why Gerbicz errors keep occurring, it turned out lack of memory was the main problem. I'd like someone to tell me how to customize the memory allocations for PRP and stage 1 of P-1.

Using all 16 cores caused my Windows operating system to crash into the bluescreen.