AMD Instinct MI400 / MI450
AMD's 2026 rack-scale answer — and the chip behind the OpenAI 6-gigawatt deal.
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 MI400 series, announced for 2026, targets 432 GB of HBM4 and roughly 40 PFLOPS of FP4 per GPU, shipping in the 72-GPU 'Helios' rack platform. In October 2025 OpenAI and AMD announced a multi-year agreement to deploy up to 6 gigawatts of Instinct GPUs beginning with MI450 in late 2026 — with an equity warrant structure — the strongest customer endorsement AMD's AI line has received. All figures are announced targets.
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
Memory
Compute
Physical
How this connects to the rest of the stack
This record's links at a glance — click a group to jump to it.
Designed by
Manufactured by
Memory technology
Interconnect & networking
Found inside
Successor to
Competes with
Sources
AMD–OpenAI announcement (Oct 2025) ↗
Record reviewed as of 2026-08-31 — see Methodology.