Frontier is 4x 200Gbps links per node into the interconnect. The interconnect is designed for 540TB/s of bisection bandwidth. <https://icl.utk.edu/files/publica

Frontier is 4x 200Gbps links per node into the interconnect. The interconnect is designed for 540TB/s of bisection bandwidth. <https://icl.utk.edu/files/publications/2022/icl-utk-1570-2022.pdf https://icl.utk.edu/files/publications/2022/icl-utk-1570-202...> Bisection bandwidth is the metric these systems will cite, and impacts how the largest simulations will behave. Inter-node bandwidth isn't a direct comparison, and can be higher at modest node counts as long as you're within a single switch. I haven't seen a network diagram for LambdaLabs, but it looks like they're building off 200Gbps Infiniband once you get outside of NVLink. So they'll have higher bandwidth within each NVLink island, but the performance will drop once you need to cross islands.