I bought one of these Mellanox ConnectX-6 CX623106A NICs last month from this seller at slightly higher price; since then, they've reposted the listing with the price lowered to $229 (plus $10 shipping). This seemed like too good a deal to pass up, so I bought another and thought you all might also appreciate a heads up as well.
Edit: as pointed out by GladLock96 below, these are actually Cisco UCS-flavored Mellanox NICs. In my experience, they are not transceiver-locked and work fine with non-Cisco switches, but GladLock96 pointed out and I confirmed with my own sample that they cannot be directly flashed by Nvidia's firmware tool to an Nvidia-supplied firmware image. Caveat emptor, they seem to work fine IME, but firmware updates will be an issue unless you have the expensive MTUSB-1 tool mentioned further downthread.
Mellanox ConnectX-6 CX623106A 2 Port 100GbE QSFP56 NIC | eBay
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Edit: as pointed out by GladLock96 below, these are actually Cisco UCS-flavored Mellanox NICs. In my experience, they are not transceiver-locked and work fine with non-Cisco switches, but GladLock96 pointed out and I confirmed with my own sample that they cannot be directly flashed by Nvidia's firmware tool to an Nvidia-supplied firmware image. Caveat emptor, they seem to work fine IME, but firmware updates will be an issue unless you have the expensive MTUSB-1 tool mentioned further downthread.
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