AMD Instinct MI300A
CPU and GPU on one package with unified HBM — the chip inside El Capitan.
You're looking at a chip record: what this processor is, its key specs, who designs, manufactures and supplies its parts, and where it gets used.
The MI300A fuses 24 Zen 4 CPU cores and CDNA3 GPU compute onto one 3D-stacked package sharing 128 GB of HBM3 — no PCIe hop, no separate memory pools. It powers El Capitan at Lawrence Livermore, the world's fastest disclosed supercomputer on the November 2024 TOP500 list.
Specifications & key facts
Each figure is labeled by basis: vendor spec, vendor claim, reported, estimate, or official. "Not publicly disclosed" means exactly that — we never invent values.
Overview
Manufacturing
Memory
Power
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Record reviewed as of 2026-01-15 — see Methodology.