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At least going forward, with both AMD's AI accelerators and Consumer GPUs using the same RDNA based IP, there will be less reason for AMD to drop RDNA GPUs from the ROCm/HIP support matrix! And so with both MI series accelerators and consumer GPUs/Graphics all using the same basic RDNA Micro-Architecture the ROCm/HIP code base developed for "CDNA5"/later will work for consumer RDNA as well with minor changes required! Polaris and Vega GPUs/Graphics both have been dropped from the ROCm/HIP support matrix. But with AMD's "The Rock" software stack making use of SPIR-V in the same manner as Nvidia/PTX there made be little issues getting that to work with older Vega/Polaris GPUs. even if AMD's not validated/verified that software stack with Consumer Vega/Earlier Consumer GPUs and Integrated Graphics. AMD's biggest issue has been dropping its older GPU micro-architectures from the ROCm/HIP support matrix too soon, and just look at Blender 3D's HIP Back End that requires RDNA2/Later GPUs and Graphics for any Radeon iGPU/dGPU Accelerated Blender 3D Cycles rendering support!

Arguably this might reduce it, because now ROCm won't be prioritised for the GCN-based systems?

Not anymore: https://rocm.blogs.amd.com/software-tools-optimization/spir-...