AMD's RDNA4 GPU Architecture at Hot Chips 2025
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AMD's RDNA4 GPU Architecture at Hot Chips 2025 is a technical blog article by Chester Lam on Chips and Cheese that unpacks AMD's Hot Chips 2025 presentation of the RDNA4 architecture used in RX 9000 discrete GPUs.
It covers media-engine encode and decode for H.264, H.265, and AV1, including low-latency modes and quality comparisons. Display topics include hardware image sharpening and multi-monitor idle power. Compute sections discuss scalar floating-point offload, split barriers, larger L2 cache, transparent compression, Infinity Fabric and Infinity Cache, RAS features, die harvesting, and the choice of a monolithic die.
It is for advanced GPU architects, driver engineers, and graphics programmers who already know prior RDNA generations and want microarchitecture notes beyond launch marketing.
The article is a free web page with AMD slide figures, measurement discussion, and comments. No registration is required.
It is useful as a structured walkthrough of RDNA4 efficiency goals across rasterization, ray tracing, ML, media, and display.