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SubjectRe: Absolutely horrid IDE performance...
On Fri, 27 Nov 1998, Philip Blundell wrote:

> >Be glad that your BIOS locks you out of UDMA with a PIIX3 HX board, or
> >you would not be able to boot at all...........
> >
> >The HX can decode UDMA but is to stupid to handle it, it is a true
> >hardware problem by design. UDMA did not exist when PIIX3 was released.
>
> Does this apply to PIIX3 VX boards as well -- ie is it the PIIX3 at fault or
> something else on the motherboard?

PIIX3 just does not have all the hardware needed to handle UDMA correctly.
Pull the Intel Specs PDF on the 430HX IDE controllers and the update
stats. They have terminated the chipset.

Yep, any thing that decodes as a PIIX3 will fail if it can decode UDMA.
Note that PPro or 440FX based chipsets seem to behave okay; however, this
is a result of only reporting DMA mode 2 on UDMA capable drives.

Cheers,
Andre Hedrick
The IDE-FNG for Linux
The APC UPS Specialist for Linux

http://www.dyer.vanderbilt.edu/server/udma/
http://www.dyer.vanderbilt.edu/server/apcupsd/apcupsd-3.5.0.bin.tar.gz



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