[formerly_proven]

Cray XT/SeaStar? iirc the interconnect ASIC pretends to be another peer CPU connected via HyperTransport. HPE Flex is similar, but works via QPI/UPI for Intel CPUs.

[nickpsecurity]

It was NUMAscale. It’s mentioned in this article with some others for comparison:

https://www.nextplatform.com/2015/07/16/what-if-numa-scaling...