PCI support for Digium Hardware

question 1:
so talking about PCI 2.2 compliant hardware and digium products such as TDM2400P, will it work in full length slots such as these listed below? I assume yes since it looks like it support either 3.3 or 5 volt, but please confirm.

32-bit/33MHz 3.3 V PCI
32-bit/33MHz 5V PCI
64-bit/66MHz PCI-X

question 2:
will the TDM2400P work better in a 65-b/66MHz slot than a 32-bit/33MHz slot? if so, can someone tell me how much difference it might make between 32 bit and 64 + 33 MHz and 66 MHz. IE, how desperately should I be making sure that I get the faster bus and wider bits?

Thanks,

Neal