[ZWoz]

That article had weird statement about PCI-X: "It did not see wide use with PCs, likely because Intel chose not to give the technology its blessing, but was briefly utilized by the Power Macintosh G5 line of computers."

I don't know, what they meant with blessing, but Intel server motherboards had PCI-X slots and this was common bus for servers/workstations. Mostly used by SCSI and RAID controllers, high-end network adapters.

[sillywalk]

The bit before it mentions it being designed for high-end workstations and servers, i.e. not PCs, but I do agree that it seems to imply Intel never used it at all, rather than rather the standard wasn't used in PCs (Intel or otherwise).