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This article is about AMD's MI455X GPUs and Helios rack-scale systems, which are AI accelerator hardware competing with Nvidia's data center offerings. The primary subject is AI infrastructure, so it passes the topic gate. aiqbench take: AMD's MI455X and Helios racks are aimed at large-scale AI training and inference, putting pressure on Nvidia's dominance in data center accelerators. For AI readers, the key questions are real-world performance per dollar, memory capacity and bandwidth for large models, and whether the software ecosystem (ROCm versus CUDA) is mature enough for production workloads. Announced specifications should be weighed against independent benchmarks once hardware ships.