Yes, $6250 per node, but that cost includes storage, compute nodes, racks, IB switches, GigE switches, consoles, PDUs, etc. At least 1/3rd of that $1B went to storage/network/infrastructure and likely much more.
Also note that the #1 on the top 500 list is using the a64fx and scales with 80% efficiency. The #8 on the list is a pure intel (no accelerators) and is 14 times smaller, and only scales with 60% efficiency. That's a pretty impressive feat since good scaling gets harder as the cluster increases in size.
Also note that the #1 on the top 500 list is using the a64fx and scales with 80% efficiency. The #8 on the list is a pure intel (no accelerators) and is 14 times smaller, and only scales with 60% efficiency. That's a pretty impressive feat since good scaling gets harder as the cluster increases in size.