The sad thing is that Hyper Transport was supposed to offer this exact feature and implement it just like SGI did with NUMAlink. There were a few boards produce

The sad thing is that Hyper Transport was supposed to offer this exact feature and implement it just like SGI did with NUMAlink. There were a few boards produced with HTX slots, I have an older Tyan dual socket Opteron board with an HTX slot kicking around. There is a connector standard: https://www.hypertransport.org/ht-connectors-and-cables https://www.hypertransport.org/ht-connectors-and-cables Connectors available from Samtec: https://www.samtec.com/standards/ht3#connectors https://www.samtec.com/standards/ht3#connectors Manycore CPU's and converged ethernet pretty much made it moot.