Not sure if this card would work on non SM motherboards but I thought the price was pretty good.
SuperMicro AOC-UIBQ-M2 2-Port InfiniBand Low Profile Adapter Card | eBay
My bid of $25 was accepted. Going to use it in my X8DTN MB which has a UIO slot
SuperMicro AOC-UIBQ-M2 2-Port InfiniBand Low Profile Adapter Card | eBay
My bid of $25 was accepted. Going to use it in my X8DTN MB which has a UIO slot