Re: Silly NIC games ...
The MAC address is unique. The manufacturer gets alloted his "prefix", which is the first 24-bits of the address, then every card they make is then given a unique address using the prefix + a serial number from the manufacturer for the second 24-bits of the address, so there should never be a conflict - if there is and both machines are on the network at the same time, it will cause problems, because the network protocols also use the MAC address.
It sounds like the manufacturer of the cards was lazy.