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Music servers and other computer based digital audio technologies.

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some guys at the Slysoft forum tried and measured it with reclock.: No HPET support in XP

Posted by hfavandepas on May 16, 2011 at 15:14:30:
Hi Grant,

Sorry for the delayed response.

I red those articles too, but I was under the false impression that the HPET wasn't working in XP because of: at the time when those articles were written (2002 – 2003), there were no drivers available for the HPET hardware. But that impression of drivers not being available than: was false.

As your research correctly shows HPET under XP isn't working. (although HPET shows up in the device list)
I found a thread on the Slysoft forum where some guys are checking the actual clock speeds with a program called 'Reclock'.
When they check the clockspeeds with the 'Reclock' program, it shows that XP (sp2 and sp3) can not use the HPET timer.

See: http://forum.slysoft.com/archive/index.php/t-22236.html

The reported 'raw speed' frequency by the 'Reclock' program under XP is: 3,5MHz. That indicates the PM timer is used.
If the HPETimer was working under XP, than 'Reclock' should have to report a raw speed of 15MHz.
So these guys on the Slysoft forum thread also show, that your research is correct. No HPET support in XP :-(

I didn't had the time too test the MS hotfix as described in KB896256 on the impact on sound quality. But I'll get back on that one.

Mark