The difference is very much physical, and 64-bit 33 MHz and 66 MHz PCI slots are not new. They are, however, not usually found in consumer boards, which is probably why you're not familiar with them, ...
Purchasing wireless adapters can help your business to extend the life of your old computers by giving them new capabilities. PCI and PC Card are two fairly common wireless adapter formats, and both ...
MSI says it's a "communications slot". AFAICT it's just a regular PCI slot.. is there a real difference there, maybe with latency or being a separate bus? I doubt it - sounds like just a marketing ...