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Gemma 4 and Qwen 3.6 with q8_0 and q4_0 KV cache: KL divergence results
r/LocalLLaMA · 13h ago · 8 · benchmark inference quantization

Empirical study showing KV cache quantization (q8_0, q4_0) has significant, model-dependent quality impact—contrary to conventional wisdom that q8_0 is "practically lossless." Gemma models show substantial degradation (KL 0.108-0.377 at q8_0) while Qwen remains robust (KL <0.04), with detailed methodology using KL divergence across 250K tokens across 6 categories, enabling engineers to make informed quantization tradeoff decisions.