NumaConnect SMP Adapter Card

Numascale's SMP Adapter is an HTX card made to be used with commodity servers with AMD processors that feature an HTX connector to its HyperTransport interconnect.

Scalable, Directory Based Cache Coherence Protocol
Write-back cache for Remote Data: 2-4-8-(16)GB options, standard SDIMMs
ECC protected with background scrubbing of soft errors
16 coherent + 16 non-coherent outstanding memory transactions
Support for single-image or multi-image OS partitions
3-way on-chip distributed switching for 1D, 2D or 3D Torus topologies
30GB/s switching capacity per node
HTX connected - 6.4GB/s
<20W power dissipation

For detailed review click their webpages.
The PDF manual is here.