AMD's roadmap for integrated graphics is becoming increasingly complex as the company appears to be looking to bridge the gap between its current offerings and the next-generation UDNA architecture. New commits to the LLVM compiler suggest that the previously spotted GFX1170 target, branded as RDNA 4m, is expanding, as two additional software IDs, GFX1171 and GFX1172, have surfaced.

As spotted by Phoronix in the LLVM compiler, these GFX117x targets are not “true” RDNA 4 parts, which reside in the GFX12 branch. Instead, they appear to be a custom evolution of RDNA 3.5. By backporting specific RDNA 4 modules into the GFX11 instruction set, AMD is creating what we might call RDNA 3.5+. This hybridisation adds support for INT8 and FP8 data types, which are essential for running the machine-learning-based upscaling and frame-generation features of FSR 4.

The decision to modify RDNA 3.5 rather than jump straight to a full RDNA 4 iGPU isn't clear, but one might guess it's due to limitations shrinking the full RDNA 4 architecture down for things like thin and light laptops, where a smaller power envelope is crucial. By updating RDNA 3.5 with WMMA (Wave Matrix Multiply-Accumulate) and SWMMAC instructions, AMD might be ensuring that its upcoming APUs can leverage FSR Redstone features.

While “Medusa Point” is expected to use an RDNA 4m iGPU, “Medusa Halo” is expected to leap straight to the RDNA 5/UDNA microarchitecture.

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KitGuru says: While RDNA 4m is mostly a rebrand of RDNA 3.5, the addition of native FP8 support could be enough to enable FSR 4. 

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The technical picture for AMD's next-generation Medusa Point APUs is becoming clearer through recent Linux compiler activity. The emergence of the GFX1170 target, explicitly labelled as “RDNA 4m”, suggests AMD will finally bring FSR4 support to its APUs.

As noted by Phoronix (via TechPowerUp), while technically part of the GFX11 (RDNA 3) family, GFX1170 is receiving specific instruction-set updates that move it closer to GFX12 (RDNA 4) behaviour, effectively creating a “Pro” version of the current RDNA 3.5 architecture. Some of the changes include adding the WMMA (Wave Matrix Multiply-Accumulate) and SWMMAC instructions, along with support for FP8 and BF8 data formats. These matrix-oriented instructions are the cornerstone of modern AI and machine learning workloads.

By implementing WMMA128b variants specifically for GFX1170, AMD is providing the foundation necessary for neural-link upscaling and frame interpolation. This architectural “hybridisation” is precisely what will allow mainstream Zen 6 APUs to support FSR 4, even without a full transition to the GFX12 graphics.

The introduction of the “m” suffix (presumably standing for “Mobile”) suggests that AMD views GFX1170 as a bridge to keep its high-volume APUs from falling behind the competition. By allowing the hardware to handle 8-bit floating-point operations natively, AMD is expanding the “Redstone” ecosystem, ensuring that even a thin-and-light laptop in 2026 can run the latest AI-enhanced titles with acceptable frame rates.

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KitGuru says: With FSR 4 bringing so many improvements over previous versions, AMD should ensure that it works across as many products as possible.