+3.3V should be created on the PWB using a regulator

[Mike Dini <mdini@dinigroup.com>]

I would like to comment that we do not believe a PCI board designer can 
guarantee that +3.3V is provided from the backplane in any PCI-based system 
that is not 66MHz.  The motherboard may have the connections, and be v2.2 
compliant, but it still is quite possible that the manufacturer of the 
computer didn't attache a power supply to the motherboard.

For the present and into the near future, all PCI designs that are not 
66MHz should create +3.3V from +5v/+12v using a regulator.

Mike Dini