It's not going to work because they are too late.

HPC cluster builds are complex enough due to the presence of multiple networks (2x moderate-scale infiniband chassis and 2x ethernet chassis as a minimum) without introducing unknown vendors. At that point, if you're doing IB, why not just go Mellanox since you will almost certainly buy 200GE Connectix NICs and not the 100G NICs from these guys.

UEC will - like most standards - _eventually_ work. In the mean time, Nvidia pods are the obvious choice for anyone who really cares about performance, and other vendors (Cisco, Arista) if they don't.