Leaked FSR4 INT8 version runs on RDNA2 and 3 with 9–13% lower performance, image quality below FSR4 FP8 but still above FSR 3.1

ComputerBase's analysis of a leaked AMD FSR 4 INT8 version, accidentally released by AMD, reveals its unofficial compatibility with older RDNA 2 and 3 GPUs, offering improved visual quality over FSR 3.1 despite performance and image stability compromises compared to the official FP8 version on RDNA 4. While the INT8 variant incurs a 9-13% frame rate reduction on older hardware versus 3-5% on RDNA 4, AMD has not commented on official support for prior architectures or the upcoming 'Redstone' technology, raising questions about its broader FSR 4 rollout strategy and competitive positioning.

Analysis

ComputerBase's analysis of a leaked FSR 4 INT8 version confirms its unofficial compatibility with AMD's RDNA 2 and RDNA 3 architectures, which lack the FP8 hardware acceleration of RDNA 4. This stems from AMD's accidental source code release, enabling modders to create functional drop-in replacements for older GPUs. The INT8 variant offers an uplift over FSR 3.1, positioning it as an interim solution for a broader user base.

While FSR 4 INT8 improves upon FSR 3.1, its image quality lags the official FP8 version on RDNA 4, exhibiting visual inconsistencies like flickering fine details and less stable foliage. Performance data shows a 9-13% frame rate reduction on RDNA 2/3 with INT8, versus 3-5% on RDNA 4 with FP8, where the RX 9060 XT even outperforms FSR 3.1 by up to 17%. This underscores RDNA 4's superior efficiency in handling the technology.

AMD's lack of response regarding official FSR 4 support for older GPUs and the upcoming "Redstone" technology, expected within three months, creates strategic ambiguity. Redstone is speculated to expand compatibility beyond RDNA 4, potentially explaining the current unofficial status for earlier architectures. This uncertainty could impact AMD's market perception and competitive positioning against rivals with established upscaling solutions.

Key Decisions for Investors

• Investors should closely monitor AMD's official FSR 4 rollout and "Redstone" announcements for clarity on broader GPU compatibility and performance targets.
• Evaluate the competitive landscape, particularly NVIDIA's DLSS, considering the performance and image quality discrepancies of FSR 4 on older hardware.
• Assess AMD's long-term strategy for AI-driven upscaling technology, as its successful implementation is crucial for maintaining market share in the GPU segment.