I learned more about PCI interfaces and the PCI standards by trying to buy the Motu sound card.

It turns out the Motu card because it is a few years old uses a different PCI standard than the motherboard and PCI interfaces in Remembrance. In fact, the Motu was designed for Pentium III era motherboards and the older 2.0 and 2.2 standards for PCI interfaces. It seems that the key thing is the voltage of these standards. The modern standards in effect since about 2002 use about 3 volts whereas the older standards used 5 volts. The Motu card that was on auction required the older 5 volt standards. So this card would not have worked in Remembrance.

At any rate I lost the auction and, in fact, the price went out of my price range.