Qwen3.8-27B-AWQ-vd

Full-INT4 re-quantization of Qwen/Qwen3.8-27B using the awq-quant-recipe pipeline. Every linear projection quantized: self-attention (16 layers), gated delta-net (48 layers), MLP (64 layers), and lm_head. Only in_proj_a/b, norms, embeddings, and the vision tower remain fp16.

16 GB (vs ~55 GB fp16 base) — fits a single 32 GB GPU with room for KV cache.

Measured performance

Metric	Value
Single-stream decode (Radeon PRO V620 + tuned kernels)	17.3 tok/s
Model size	16 GB
Quality gates	per-module rel-err ≤ 0.11 (ALS-fitted); Stage E PASS

First-serve measurement with no per-shape kernel tuning applied — the 4B equivalent went from ~45 to 97.9 tok/s through kernel optimization (see gfx1030-vllm-0.26). Similar tuning on the 27B's shapes is expected to improve throughput.

Quantization details

• Method: AWQ INT4, group_size 128, asymmetric zero-point
• Scale fitting: alternating least-squares (ALS) per-group grid fitting
• LN-fold fix: the (1+w) norm-fold defect in the AutoAWQ fork is corrected (see FINDINGS.md)
• lm_head: untied (tie_word_embeddings: false), INT4-quantized via ALS
• in_proj_a/b: fp16, exactly compensated with 1/s

Usage

vllm serve ikantkode/Qwen3.8-27B-AWQ-vd \
    --dtype float16 --max-model-len 8192 \
    --attention-backend ROCM_ATTN

Requires vLLM with ROCm support. On gfx1030 (Radeon PRO V620), use the deploy kit for one-command setup.

Lineage

• Base: Qwen/Qwen3.8-27B (Apache-2.0, bf16, ~55 GB)
• Recipe: ikantkode/awq-quant-recipe (8-step pipeline)
• First application of the recipe to a model larger than 4B — validates the pipeline's model-size-agnostic claim

Related

• 4B equivalent: 97.9 tok/s
• Quantization recipe
• Serving kernels
• Docker image