AMD adds a 288GB alternative to its 432GB AI accelerator

The new accelerator joins the same Helios platform and ROCm software ecosystem. AMD describes the pair as sharing core compute and networking capabilities while offering different memory capacities. [1][2][3]

The difference is 144 GB, or 50% more capacity on MI455X. Both product sheets list 23.3 TB/s peak memory bandwidth. Capacity determines how much state can fit; bandwidth describes the rate at which memory can transfer data. More of the former does not imply more of the latter. [2][3]

This choice matters when model weights, context, concurrent requests and runtime overhead approach available memory. Measure that combined requirement before comparing throughput or latency. The announcement gives no price or shipping date, so it does not yet settle which configuration is available or cheaper for a particular deployment. [1][2][3]