Thanks. I setup my user, set boinc to 50%, set 17 or bust only, added project... and forgot to set 8 threads per task and now have 16 1 cpu tasks. I updated the preferences, but my client isn't changing. Will it eventually switch on its own, or will I need to abort these tasks and get new ones?This one is probably as close as any as it pertains to this specific challenge - https://forums.anandtech.com/threads/primegrid-challenges-2021.2589211/post-40462572
But, the main things would be turn off SMT either through the bios, or task manager processor affinity(if running Windows), or by setting BOINC to use 50% of CPU's. Then configure in your Primegrid preferences to only run Seventeen or Bust tasks and to use 8 threads per task. I think if you're running Windows it will help to configure processor affinity per Primegrid process to keep each Primegrid task running on a single CCX. On Linux it seems to sort itself out on its own. This is all under the assumption it's on your 5950x, other processors would need different thread counts potentially based on cache, etc.