[dogma1138]

It doesn’t matter nearly all Mellanox ASICs support both IB and Ethernet they are the ones who are driving the speed of Ethernet to this level.

You also need to use their cables and transceivers (or a similar alternative) for these speeds doesn’t matter if you are using Ethernet or IB.

[shaklee3]

You can use non-mellanox cables for ethernet. IB there aren't really other options.