> There is a proper standardised 66MHz variant of PCI, which is used on a
> lot of Alpha, and (I think) Xeon boards. There's 64bit PCI, too, with an
> extra connector for the extra lines. Most dedicated x86 users seem
> unaware of these.
[...]
> 66MHz PCI is actually somewhat troublesome. Most real 66MHz
> implementations seem to have just 2 card slots per bus. That only just
> scrapes through the definition of a bus. Add more slots and things get
> flakey.
As a non-x86 example, the 400 MHz Macintosh G4 motherboard uses three
33 MHz 64-bit PCI slots, and one 66 MHz 32-bit PCI slot for graphics.
However, the new 450 and 500 MHz G4 motherboards replace the 66 MHz PCI
slot with an AGP 2x slot (and other interesting things, like internal
400-Mbps FireWire and making the external USB ports dual-channel).
-- Steve Bonneville
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