AMD launches Instinct MI455X GPU and Helios AI rack

AMD unveiled its most advanced artificial intelligence hardware to date on Thursday, July 23, 2026, introducing the new Instinct MI455X accelerator and the Helios rack-scale platform in a direct challenge to market leader NVIDIA. The announcements, made at the company's Advancing AI event in San Francisco, mark a significant escalation in AMD's bid to capture a larger share of the booming AI data center market.

The Instinct MI455X GPU is the centerpiece of the new strategy. Based on AMD's CDNA 5 architecture and built with a mix of 2-nanometer and 3-nanometer chiplets, the processor packs 320 billion transistors and is designed specifically for large-scale AI training and inference. A key advantage is its memory configuration: each MI455X carries 432 gigabytes of next-generation HBM4 memory, offering 50 percent more capacity than its predecessor and a peak bandwidth of 23.3 terabytes per second. AMD claims the chip delivers up to 40 petaflops of compute for lower-precision formats common in AI workloads, representing up to a fourfold performance increase over the previous MI355X generation.

AMD executives positioned the MI455X as a competitive alternative to NVIDIA's upcoming...