Dell 0V5DG9 = Mellanox ConnectX-5 MCX512F, no suffix on the label, except with a Dell short bracket. No LED's. Dual port 25Gb EN, PCIe x16
Has a Dell OEM PSID.
Probably equivalent to MCX512F-ACAT.
Snagged a couple of pulls on the cheap, trying to figure out if I can tweek them into taking the standard Mellanox firmware.
Been playing with one of them a little while waiting for tall brackets arrive from the Mellanox store. They do have LED's, tiny ones on the edge of the card, but no plastic light pipes. They do inter-operate just fine with 10gb ConnectX-3 EN cards and accept the same 10gb EN passive copper cables.
They are Dell OEM, and have a Dell PSID of something like 00000015. Meaning the only firmware update source is Dell, the Mellanox firmware won't load. No Linux package available, just Windows from Dell. But the .exe is just a self-extracting archive and easy to pull the .bin payload for the card. Just specify the source directory to the firmware file and Mellanox tools from OFED 5.0-1.0.0.0 package did a painless flash update.
Latest Dell Firmware is from January. It doesn't exactly match up with any of the Mellanox packages. Figured it would be a Dell blessed, re-release of a Mellanox package, but it appears to be a branch of stuff between MLNX releases.
ConnectX-5 is supported better by Nvidia deep-learning containers than ConnectX-3 for RDMA and so on. I'd like to play around with GPU Direct over RoCE between some Xeon workstations. Not sure whether I really need VPI/Infiniband for that, or if the EN cards will work.
But they were reasonable in price and I'll see what I can get out of them. If I can get them to do what I want, I might spring for the 25gbEN cable.