SMT / HT CPU Test


For a while i was wondering how simultaneous multithreading (SMT) or hyperthreading (HT) affects PC performance. Especially after Intel removed HT from i7 line of CPUs.

I disabled SMT in BIOS, ran tests, then enabled SMT, ran tests again, here are results: [https://i.imgur.com/XkrVbL3.png](https://i.imgur.com/XkrVbL3.png)

As you can see SMT has no effect on 1/2/4 core performance, which is a likely scenario during gaming.

In multicore test SMT adds 43% more performance, which is a likely scenario during production (rendering/compressing/encoding).

My conclusion.

1. SMT/HT should not have impact on gaming performance in most of scenarios.
2. For production tasks (due to SMT) AMD offers a much better performance per dollar than Intel, as example [https://cpu.userbenchmark.com/Compare/Intel-Core-i5-9600K-vs-AMD-Ryzen-7-2700X/4031vs3958](https://cpu.userbenchmark.com/Compare/Intel-Core-i5-9600K-vs-AMD-Ryzen-7-2700X/4031vs3958)



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2 thoughts on “SMT / HT CPU Test”

  1. some games despise HT.Black desert/pillars of eternity/Monster hunter world for example.All run better when disabling the fake cores

  2. In my case SMT/HT introduces anomalous performance behaviours, like Windows Explorer taking random amounts of times to display the contents of folders, games intermittently suffering a drop in FPS for no apparent reason and introduces problems where programs seemingly permanently freeze.

    Turning it off fixes those issues 100%, this is with my ancient Intel i7 920 CPU so it wouldn’t surprise me if Microsoft introduced some compatibility issues with the CPU over the years.

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