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Metal Quantized Attention on M5 Max

Metal Quantized Attention on M5 Max

by liuliu·Apr 1, 2026·4 points·0 comments

AI Analysis

●●SolidWizardryBig Brain

Custom Metal shaders deliver 1.87× speedup over FP16 baseline with Int8 matrix multiplication.

Strengths
  • Row-group-wise scale quantization for queries/keys is a clever optimization choice.
  • Fused kernel handles quantization, multiplication, and dequantization in single pass.
  • Real benchmarks with specific TFLOP measurements, not vague performance claims.
Weaknesses
  • Feature release for existing Draw Things app, not a standalone new project.
  • Apple Silicon only — RTX 5080 Mobile users can't benefit from this work.
Category
Target Audience

ML engineers optimizing inference on Apple Silicon

Similar To

MLX · llama.cpp · Stable Diffusion optimizations

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