I'm using Mellanox ConnectX-3 cards, IIRC they're HP branded. They shipped in Infiniband mode and required a small amount of command line fiddling to put them in ethernet mode but it was pretty close to trivial.

They're PCIe 3.0 x8 cards so they can't max out both ports, but realistically no one who's considering cheap high speed NICs cares about maxing out more than one port.