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Matthew, As Tom mentioned, there are still a number motherboards out there supporting 5 volt PCI. I didn't look extensively, but they're not very common in off-the-shelf server class systems (Dell), and have mostly disappeared from rackmounts as has the 3.3 volt PCI slots; Instead, we're using a Magma PCI expansion chassis found at; <http://www.mobl.com/expansion> Where Magma is handling the PCI-X / PCI-E / next generation interface to PCI going forward. When the computer system bus interface changes, we can buy a new host interface card (for around $175) and keep the expansion chassis and cabling. This allows us to use a standard platform (like a Dell rackmount) and keep up with server technology while still using the older 5 volt PCI cards. The plan is that this will carry us through the lifetime of the satellites using this technology. The disadvantage is that the investment is upfront. mike