Reviewing HPC hardware is not easy. You usually need to travel to a data center and look at a rack of servers while someone tells you where they landed on the Top500 list. One could review a server, but basically they are all pretty much the same inside. They are running Linux and use either AMD or Intel processors. In addition, testing a cluster takes time because running meaningful programs that exercise the whole system must be done carefully. And finally, clusters are not sitting on the “shelf” as they vary by customer due to possible packaging, interconnect, processor, and storage choices.