True. But a bit of a pain to cable tho, as the modules are stuck to the cableIf you need I have two long, fiber FDR cables for sale.
I believe they're Mellanox genuine ones, but time will tell with eBayIf you got genuine ones then OS shouldnt be an issue, fw links above.
Have not used transceivers on mine (DAC only) but I believe MLX are not locked, so most should work fine.
The goto card for these would be a (branded) CX356, flashed to native MLX for ~$20 ea - various threads about these here too.
Any chance that you got around to testing this @Rand__ ?If its not urgent I can test a pair of 100G modules on my 6036 to see if they do 56 or 40 only
*********************Tested 5m fiber Mellanox 100G cable from EDR switch, unbelievable, but that 100G xceiver supported multirate of both 40/56/100G.