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Gemma 4 31B quantization tests yield confusing results

A user on r/LocalLLaMA is seeking an explanation for unexpected benchmark results comparing different quantization methods of the Gemma 4 31B model. Their tests indicate that standard Q4 quantization performed better than the newer QAT Q4 versions, with Q4_K_M outperforming all others in terms of perplexity. The user detailed their rigorous testing methodology, including the specific hardware, inference engine, and parameters used, to ensure the results were not due to noise or experimental error. AI

IMPACT User-generated benchmarks highlight potential discrepancies in model quantization quality, prompting community discussion on performance metrics.

RANK_REASON User-conducted benchmark and analysis of model performance. [lever_c_demoted from research: ic=1 ai=1.0]

Read on r/LocalLLaMA →

AI-generated summary · Google Gemini · from 1 sources. How we write summaries →

COVERAGE [1]

  1. r/LocalLLaMA TIER_1 English(EN) · /u/bitslizer ·

    Gemma 4 31B QAT Q4 vs standard Q4 — Top1 KLD benchmark results have me confused. Someone please explain or poke holes in this.

    <!-- SC_OFF --><div class="md"><p>I'll be upfront: I vibe-benched and vibe-reported this with Claude Sonnet 4.6, but I reviewed and edited everything before posting (too lazy to take out all the AI EM dash —), so hopefully nobody considers this AI slop. And more importantly, I ge…