My super-duper 8 core MacPro should arrive on Monday. As well as an extra 12 gig of ram in addition to Apple's 1, I've got a Sonnet USB express card to go into it. There are 4 external USB sockets and one internal. I've got a cordless Logitech Wave keyboard and mouse which use a USB receiver. Could I plug the receiver into the internal socket on the sonnet card, or will the metal casing stop it sending/receiving? If not, what else could I plug into the internal socket. I hate to waste it as I've got a lot of other things that want USB ports.