geekbench 5 is having an issue with 256 threads, giving poor results and taking over 30 mins to run

Dan's Avatar


02 Oct, 2019 01:18 PM

trying to break some worlds records with a dual EPYC ROM 7742, but having issues with several benchmarks includeing Geekbench 5
Benchmark has been running fo 31mins so far and the end score will be pretty rubbish. This is despite the 128 (real) cores in the system running at the full boost clock of 3.4GHz most in most of the 100% all core loads, due to the CPUs having 240Watt limit and liquid cooling.
final scores were 1010 single and 16865 multi, which I can beat if pull one of the EPYC CPUs out of the system
Note: this system had broken 3 other world records so its not a problem with the system :)

  1. Support Staff 1 Posted by John on 07 Oct, 2019 04:03 PM

    John's Avatar

    Geekbench 5 for Windows can have scaling issues on systems with multiple NUMA nodes. Do you have a link for the results for this system?

  2. 2 Posted by Dan Goldsmith on 09 Oct, 2019 06:38 PM

    Dan Goldsmith's Avatar

    Hi John,

    Just ran again it’s 351834

    Get Outlook for iOS<>

  3. 3 Posted by Mark on 12 Oct, 2019 01:08 AM

    Mark's Avatar

    Also want to follow up with this - I ran Geekbench on a Ubuntu 18.04 release and saw similar issues. I'm using half the cores I expect on a monolithic VM (128 vCPU on 2x64 core pCPU). I'm not sure how to work around this but there must be a way. Geekbench was ran on other Epyc Rome systems successfully.

    It could be related to NUMA since that would equal one socket in this case.

    On Windows, Geekbench5 won't run for me.

Reply to this discussion

Internal reply

Formatting help / Preview (switch to plain text) No formatting (switch to Markdown)

Attaching KB article:


Already uploaded files

  • Geekbench_issues_with_256_threads.jpg 409 KB

Attached Files

You can attach files up to 10MB

If you don't have an account yet, we need to confirm you're human and not a machine trying to post spam.

Keyboard shortcuts


? Show this help
ESC Blurs the current field

Comment Form

r Focus the comment reply box
^ + ↩ Submit the comment

You can use Command ⌘ instead of Control ^ on Mac