Cray EX235a is the blade for Cray EX platforms that hosts an AMD Trento CPU and four AMD MI250X GPUs.

Each blade has two nodes, and each node has1

  • 1x AMD Trento CPU
  • Up to 512 GB DDR4 DRAM
  • Up to 2x NVMe SSDs
  • 4x AMD MI250X GPUs
  • Up to 4x Slingshot-11 NICs

These nodes are unique for a few reasons:

  • AMD Trento is a modified version of AMD Milan that has Infinity Fabric connections to the MI250X GPUs, allowing the GPUs’ HBM to be cache coherent with CPU memory.
  • The Slingshot-11 PCIe NICs are attached to the GPUs’ PCIe ports, not the CPU’s.

Footnotes

  1. Frontier System Architecture (ornl.gov)