AMD's MI455X reportedly delivers 432GB of HBM4 and 23.3TB/s bandwidth
art_zucker · x · 2026-07-24
AMD's MI455X sample reportedly packs 432 GB of HBM4 and 23.3 TB/s bandwidth
A post quoting an early access test of AMD's Instinct MI455X says the chip offers:
- 432 GB of HBM4
- up to 23.3 TB/s of bandwidth on a single GPU
- 99.5% success rate across a core Transformers model suite after close work with AMD
The update reads like an early validation of AMD's next-generation accelerator for large-model workloads, with the headline specs centered on memory capacity and bandwidth.
Related event: AMD MI455X Early Tests Reveal 23.3TB/s HBM4 Bandwidth(2 posts)→
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