Hyperthreading on vs off

Patishi · Post by **Patishi** » Mon Mar 30, 2026 11:22 am

Hi everyone,
I want to ask if you use hyperthreading with stockfish (or any other engine) when analyzing.
I remember that it was well known that it's better to use only the physical cores, but maybe things have changed in recent years.

Thx.

Dann Corbit · Post by **Dann Corbit** » Mon Mar 30, 2026 4:04 pm

I think HT off is better. My Threadripper runs hotter when I use HT and it can even result in CPU throttling down. For a long time I ran HT because I wanted finer percentage control overy CPU usage, but now I think it was a mistake to run hyperthreads.

Patishi · Post by **Patishi** » Mon Mar 30, 2026 4:13 pm

Dann Corbit wrote: ↑Mon Mar 30, 2026 4:04 pm I think HT off is better. My Threadripper runs hotter when I use HT and it can even result in CPU throttling down. For a long time I ran HT because I wanted finer percentage control overy CPU usage, but now I think it was a mistake to run hyperthreads.

Yeah, the temperature difference is substantial.

Modern Times · Post by **Modern Times** » Mon Mar 30, 2026 5:58 pm

On modern CPUs with modern engines, yes when analysing or for online play. I don't have any issue with temps generally.

When running ratings lists games, absolutely not.

Jouni · Post by **Jouni** » Tue Mar 31, 2026 12:37 pm

There was a test with TCEC hardware: 256 threads vs 512 threads. Ended 50-50.

Jouni · Post by **Jouni** » Tue Mar 31, 2026 2:38 pm

Sorry I forgot engine was Stockfish. I don't find match in Archive.

Hyperthreading on vs off

Hyperthreading on vs off

Re: Hyperthreading on vs off

Re: Hyperthreading on vs off

Re: Hyperthreading on vs off

Re: Hyperthreading on vs off

Re: Hyperthreading on vs off