anyone using infiniband at home for direct connection between computers? SMB3 allowing speed breakthroughs?

good evening,

i've been looking for a cheaper alternative to 10GbE switches, and (as many others have) came across infiniband.

after reading several articles from 2011 about effective speed limitation due to SMB latency and not playing nice with RDMA, i've finally found a more recent one, that discusses SMB Direct, with SMB3, now being able to use RDMA.

https://www.starwindsoftware.com/blog/smb-direct-the-state-of-rdma-for-use-with-smb-3-traffic-part-i

if i understand correctly, infiniband allows direct connection between two computers with HCAs.

does that mean i could pick up two $25 inifiniband HCAs from ebay, and get 40Gb/s bandwidth between the two computers??

thanks!