Story · AMD
AMD Unveils MI455X AI Accelerator and Helios Rack-Scale Architecture to Compete with Nvidia
At its Advancing AI 2026 event, AMD revealed the Instinct MI455X GPU, a 320-billion-transistor chip built on TSMC 2N GAA and N3P processes using advanced packaging. The MI455X features CDNA 5 architecture with 256 Work Group Processors, a wavefront size of 32, and up to 4x performance gains in lower-precision formats like MXFP4 and MXFP8 compared to the previous MI355X. AMD also introduced the Helios rack-scale architecture, linking 72 GPUs into a coherent system to rival Nvidia's NVL72. Theoretical peak performance exceeds Nvidia's Rubin GPU in several metrics, though AMD acknowledged real-world performance may be lower. Key customer wins include deals with Microsoft and Anthropic.
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