Uh, more like converting a Ford Mustang GT to a Ford Model -T.
As to the OP's Q -- it depends. PCI-X is, in many ways, backward
compatible with the earlier PCI; so much so that many old PCI boards
will work in a new PCI-X bus slot.
The biggest potential problem is voltage: PCI migrated over time
from a 5V bus to a 3.3V bus. Old 5V cards will work in old PCIs and
in some of the middle-aged PCIs that supported both voltages, but
they won't work in new PCIs that only support 3.3V.
You can't, and don't need to - given that PCI Express motherboards
also include "normal" PCI slots. Perhaps one day we'll see mobos that
have PCI Express only, but we're far from that; I've yet to see a PCI
Extress "1x" card (the small black sockets), only the "16x" SVGA cards
(the big black socket where AGP would normally be).
The white PCI slots are still normal PCI, but there's no AGP anymore.
You can't, and don't need to - given that PCI Express motherboards
also include "normal" PCI slots. Perhaps one day we'll see mobos that
have PCI Express only, but we're far from that; I've yet to see a PCI
Extress "1x" card (the small black sockets), only the "16x" SVGA cards
(the big black socket where AGP would normally be).
Uh, PCI-X does not refer to PCI Express. PCI Express, frequently
abbreviated as PCIe, is a serial point-to-point interconnect. PCI-X
refers to the (eXtended-capability?) versions of PCI; PCI-X buses, like the
earlier PCI buses, are parallel.
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