PCI card in PCI-X slot?

Problem is that all of Apple's language is vague. And the fact that there are PCI PMG5s and PCI-X PMG5s doesn't help make things clearer.

Apple will make statements like "Depending upon the model of your Power Mac G5, you can install either PCI or PCI-X cards" (does the "or" refer to each machine respectively? The PCI machine can't run PCI-X cards, so maybe so...) which isn't as clear as saying "either PCI or PCI and PCI-X cards."

THe first link is helpful, but they only mention PCI-X once (or is the term "PCI" used generically to refer to the larger set of both PCI and PCI-X?) so it still isn't expressly clear. (Although the statement about "Designed to the specification" might be meaningful if it weren't for the fact that specs aren't always followed and/or extended in novel ways.)

After some sifting the xlr8 indicates some PCI cards being used in PCI-X, so that was a bit more clear.

But in the mean time I found this:

http://developer.apple.com/documentation/Hardware/DeveloperNotes/Macintosh_CPUs-G5/PowerMacG5/4Expansion/chapter_5_section3.html#

which should clearly spell out the requirements for the slots in a PCI-X machine.

Thanks, but I read that before posting.

Tells me a bit about the PCI-X spec, but doesn't tell me how well one manufacturer, in one product, adhered to the spec.

Apple has been know to adopt draft specs, and/or extend specs in... uh... "novel" ways, so I was looking more for information specific to the G5s, than general info about the spec.