SAM 3.1 Quantized to INT4: 40% VRAM Savings with Identical Mask Quality
External_Quarter · reddit · 2026-07-31
A developer quantized SAM 3.1 to INT8 and INT4, maintaining compatibility with native loaders. The INT4 version is almost 40% smaller than the fp16 checkpoint, saving about 600 MB in VRAM while keeping mask quality nearly identical. Inference speed sees only a marginal improvement, though SAM is already quite fast.
Related event: SAM 3.1 Quantized to INT4: 40% VRAM Reduction with No Quality Loss(2 posts)→
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