DOS ain't dead

ACPI tools 1.3 (Announce)

posted by Zyzzle, 16.06.2026, 22:59

> And not just this. CPUSPD supports also ODCM and throttling methods,
> P-state changes, VID, L1/L2 cache enable/disable, branch prediction and
> prefetch enable/disable so it allows really wide CPU speed and power
> consumption variability. I tested on my SandyB and can lower multi from 45x
> down to 16x, P-state/ODCM/throttle not supported here. In most cases I
> don't need my DOS sprinting at 4,5GHz so it's fine to be able to relax it
> and spin down the fans... :)
Yes, strange thing about CPUSPD with my CPU (i5-8250) is that if I first set BIOS to turn off all CPU cores but primary, and disable hyperthreading, I can change multiplier granularly and singly from 9x to 34x. (And ODCM/throttle is supported with 16 levels). However, if I leave SMP and hypthreading on (this i5 is quad-core), then I can only adjust multiplier to 15x,16x or 34x, and nowhere in between. Some sort of strange effect with SMP being enabled in the BIOS disabling multiplier changing in DOS.

(Lowering my CPU multi from 34x to 9x lowers my CPU voltage from 1.04V to 0.59V, and DOS cpu temps as measured by your CPUSPD program go down from 69C to 43C).

Complete thread:

• ACPI tools 1.3 - Laaca, 16.06.2026, 00:28 (Announce)
  • ACPI tools 1.3 - mceric, 16.06.2026, 01:14
    • ACPI tools 1.3 - Laaca, 16.06.2026, 16:27
      • ACPI tools 1.3 - RayeR, 16.06.2026, 19:14
        • ACPI tools 1.3 - Laaca, 16.06.2026, 22:05
        • ACPI tools 1.3 - Zyzzle, 16.06.2026, 22:59
  • ACPI tools 1.3b - Laaca, 16.06.2026, 23:04
    • ACPI tools 1.3b - RayeR, 18.06.2026, 06:53
      • ACPI tools 1.3c - Laaca, 20.06.2026, 22:55