I agree that 2.5/5 are weird use cases, but after a cursory look over this space (so my conclusion may be wrong) I've found that: 1. End devices with 10 Gb por

I agree that 2.5/5 are weird use cases, but after a cursory look over this space (so my conclusion may be wrong) I've found that: 1. End devices with 10 Gb ports seem uncommon. The copper variety of adapters seem to run hot, so they're either huge or noisy. This makes them somewhat impractical for the current tendency of "lean" / quiet builds. Whereas most MB seem to have at least a copper 2.5 Gb port, when it's not 5. I've seen USB dongles which are the same size as a Gb one and barely more expensive. 2. The intermediary speeds being "weird", they're not always supported by 10 Gb switches. My Brocade has 10 Gb SFP ports, but they only do either 1 or 10 Gb. I didn't look very hard, but I've never seen any copper module do anything else. Also, 10 Gb copper modules are quite expensive. I've seen managed Netgear switches specifically advertise 2.5/5 Gb copper ports. They're quite cheaper than equivalent 10 Gb switches. Personally, I don't have a use for anything more than 1 Gb (yet) so I've only looked over these things out of a little curiosity. But I can see why people who want to have higher speeds would be interested in these intermediary switches.