Qwen3.8-27B Test: Lower KV Cache Quantization Impacts Reasoning Quality
fbms2 · reddit · 2026-08-20
User testing the Qwen3.8-27B-Q6K model found significant quality variations based on KV Cache quantization levels.
Observations:
- Q8/Q8: The model exhibits deeper thinking and noticeably better output quality.
- Q4/Q4 or Q8/Q4: The model tends to answer directly with less reasoning, resulting in lower quality.
This suggests that in local deployment or quantization scenarios, KV Cache bit-width is not just a VRAM trade-off but directly impacts the model's deep reasoning capabilities.
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