add a column for GPU interconnect

[charlesfrye]

Explain why the information needs to be updated.

GPU interconnect tech (SXM vs PCIe) substantially impacts performance of accelerated workloads (source), especially those with heavy GPU-to-GPU communication, e.g. tensor parallel calculations. They also impact price.

MVP: PCIe or SXM? Better: PCIe vs SXM,2,3,4,5