El Capitan is a Cray EX255a/MI300A supercomputer at LLNL that debuted at the #1 position on the November 2024 Top500 list with an HPL score of 1.742 EFLOPS. The HPL run took 6,306 seconds, or 1.75 hours.
System overview
El Capitan has:1
- 11,136 Cray EX255a compute nodes
- 44,544 AMD MI300A APUs total
- 87 cabinets
- 696 Rabbit blades (8 per cabinet)2
- 34.8 MW peak, 30 MW running HPL2
El Capitan uses a Slingshot-11 fabric in a dragonfly topology.
Node architecture
Each Cray EX255a node has:
- 4x AMD MI300A APUs (see Specifications)
- 512 GB HBM3 using 8-high stacks
- Fully interconnected sockets
Storage subsystem
El Capitan features two storage subsystems:2
- 696 Rabbit blades, providing near-node-local storage on the Slingshot fabric
- A global Lustre file system named Merced