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In Reply to: RE: Fishy Secrets Part 2 or bright fish in the bowl posted by steppe on December 03, 2011 at 11:59:54
Hi Serge
I'm very curious to know what you hear when switching HPET ON/OFF in your BIOS (...no other changes of course, just the HPET).
This question comes from the research I did earlier this year on using the HPET within a Windows XP context. The results/conclusions were posted in the cMP forum, see -> http://www.audioasylum.com/forums/pcaudio/messages/8/88573.html
In essence, XP-SP2 (and beyond) can recognize the presence of HPET on a modern mobo, but XP has no driver for it, and therefore CANNOT benefit from it's use. Not directly anyway.
However, if you are hearing a change in SQ by toggling this component in BIOS (and I certainly trust your reporting on the effect of subtle changes), some other mechanism must be responsible.
Here's a wild guess: perhaps it's related to EMI/RFI pollution on that particular mobo ? Maybe other mobos don't react the same way. This is all speculation on my part, but I just had to make up some kind of shaky answer.
Looking forward to your reply.
Cheers,
Grant
That's not a Toy... IT'S A TOOL !!
Follow Ups:
In fact the hpet device is in your system and is enabled without drivers like a vga compatible video controller, see the picture. The sound seemed colder? but more precise. (or I talked myself to believe). I want yet to try bigger values. and see. After all it was about a month ago. But I Kept this setting, so there was a change for the better. Grant, try the whole string I posted, in your bios and say if you like it or not. Only, the whole string.
Serge.
Give it a 1-1,5 hours time to settle.
Edits: 12/03/11
The pic is from untweaked russian xp on my work machine it is High precision event timer. If you rightclick it you read the drivers are not installed (Code 28) and below in device usage - Use this device (enable) and in resources you will see the irq etc.
Hi SergeI too get the equivalent Device Manager info for the HPET device... BUT, XP is not able to use it ! The fundamental code of XP was cast in stone long before HPET devices were implemented on motherboards.
If you read the (rather long) post indicated above (from the cMP thread), you will see the quote supporting this notion, and a link to where I found the information.
Regarding BOOT.INI parameters, my file contains all switches shown above except "/onecpu" and "/MAXMEM=256"... it's been that way as far back as spring of this year. I use a 512 mb stick of Hyper-X RAM, and run cMP^2 on the G31M mobo (...ancient, but still effective).
When you get the chance to test HPET In/Out, please lets us know your findings.
Cheers,
Grant
That's not a Toy... IT'S A TOOL !!
Edits: 12/04/11 12/11/11
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