Qwen3.8-27B-ROCmFPX

ROCmFPX quantized GGUF (7 tiers + vision mmproj) of Qwen/Qwen3.8-27B — official BF16 weights, locally requantized.

⚡ Quick Start

Requires strix.cpp (this fork supports ROCmFPX; upstream llama.cpp cannot load these files — format note at the end).

# Text only (smallest tier: Q4_FAST ~13.6 GiB)
strix-server -m Qwen3.8-27B_Q4_0_ROCMFP4_FAST.gguf -ngl 99 -fa on --port 8080

# Vision: add --mmproj mmproj-Qwen3.8-27B_BF16.gguf
# All tiers fit on a single 128 GB machine (largest: 26.7 GiB)

🎯 Which tier? (3-second decision)

  • Fastest: Q4_0_ROCMFP4_FAST (13.6 GiB)
  • Speed + stabler quality: Q4_0_ROCMFP4_STRIX (14.0 GiB — recommended sweet spot)
  • Higher-bit reference: Q6_0_ROCMFPX (21.0 GiB)
  • Agent / tool-call: Q6_0_ROCMFPX_AGENT (23.6 GiB) / Q8_0_ROCMFPX_AGENT (26.7 GiB)
  • Quality first: Q8_0_ROCMFPX (26.3 GiB)

Model Overview

  • Base model: Qwen3.8-27B (dense, official weights by Alibaba)
  • Quantization: BF16 -> ROCmFP4 / ROCmFPx, 7 variants
  • MTP: GGUFs carry an MTP head — enable with strix-server --spec-type draft-mtp (speculative decoding)
  • Vision: multimodal — pair with the bundled mmproj (see Usage)

Files

File Size
Qwen3.8-27B_Q4_0_ROCMFP4_FAST.gguf 13.56 GiB (14,562,235,840 B)
Qwen3.8-27B_Q4_0_ROCMFP4_FAST_COHERENT.gguf 13.90 GiB (14,929,749,440 B)
Qwen3.8-27B_Q4_0_ROCMFP4_STRIX.gguf 13.98 GiB (15,013,963,200 B)
Qwen3.8-27B_Q6_0_ROCMFPX.gguf 20.98 GiB (22,528,382,400 B)
Qwen3.8-27B_Q6_0_ROCMFPX_AGENT.gguf 23.55 GiB (25,283,188,160 B)
Qwen3.8-27B_Q8_0_ROCMFPX.gguf 26.26 GiB (28,193,396,160 B)
Qwen3.8-27B_Q8_0_ROCMFPX_AGENT.gguf 26.69 GiB (28,664,108,480 B)
mmproj-Qwen3.8-27B_BF16.gguf 0.87 GiB (931,145,952 B)

SHA-256 checksums for all files: see sha256.txt.

Quantization Tiers — what's here & how to choose

All files are builds of the same official weights through llama-quantize (strix.cpp fork); upstream llama.cpp cannot load them (see Format Note). Quick guide:

  • Q4_0_ROCMFP4_FAST — smallest & fastest baseline (4.25 bpw). Bulk weights in single-scale FP4.
  • Q4_0_ROCMFP4_FAST_COHERENT — FAST + Q6_K token embeddings (better coherence, +0.2 bpw).
  • Q4_0_ROCMFP4_STRIX — FAST + Q6_K embeddings + dual-scale attention K/V (quality-biased; same speed class as FAST — the recommended quality/speed sweet spot).
  • Q6_0_ROCMFPX / Q8_0_ROCMFPX — higher-bit reference layouts (6.50 / 8.25 bpw). Decode is slower than the Q4 family on this dense model (Q6's unpack overhead is the heaviest).
  • Q6_0_ROCMFPX_AGENT / Q8_0_ROCMFPX_AGENT — agent / tool-call oriented routing variants (attention & FFN boosts on sensitive layers).

The full type ladder lives in the strix.cpp repo (llama-quantize --help).

Benchmarks (llama-bench)

Measured on AMD Strix Halo (gfx1151), llama-bench -ngl 99 -p 256,2048 -n 256 -r 5, strix.cpp build 11107. (Dense 27B — all parameters active, so tg is inherently lower than MoE models. Each figure is the mean of the last 4 of 5 reps — the first rep carries one-time warm-up cost and is excluded.)

Variant tg256 (t/s) pp256 (t/s) pp2048 (t/s) Size bpw
Q4_0_ROCMFP4_FAST 14.05 418.0 398.9 13.6 GiB 4.25
Q4_0_ROCMFP4_FAST_COHERENT 13.99 404.0 389.8 13.9 GiB ~4.45
Q4_0_ROCMFP4_STRIX 14.02 400.2 385.4 14.0 GiB ~4.49
Q6_0_ROCMFPX 9.45 312.1 309.3 21.0 GiB 6.50
Q6_0_ROCMFPX_AGENT 8.70 335.6 330.4 23.6 GiB 6.50
Q8_0_ROCMFPX 7.93 371.8 365.6 26.3 GiB 8.25
Q8_0_ROCMFPX_AGENT 7.83 368.9 363.0 26.7 GiB 8.25

Usage

# Text only:
strix-server -m Qwen3.8-27B_Q4_0_ROCMFP4_FAST.gguf -ngl 99 -fa on --port 8080

# Vision (multimodal; --mmproj enables image input):
strix-server -m Qwen3.8-27B_Q4_0_ROCMFP4_FAST.gguf --mmproj mmproj-Qwen3.8-27B_BF16.gguf -ngl 99 -fa on --port 8080
  • Swap -m to any other variant file to run that variant (see Files).
  • OpenAI-compatible API served at http://127.0.0.1:8080/v1.
  • MTP head: load with strix-server --spec-type draft-mtp for speculative MTP acceleration.

Format Note (ROCmFPX)

ROCmFPX is a quantization format family (strix.cpp extension: GGML types 100–107 / FTYPE 100–119) — upstream llama.cpp cannot load these files. Load them with strix.cpp, a llama.cpp fork that supports all upstream GGUF formats plus ROCmFP4/ROCmFPx natively.

License & Disclaimer

  • Base model: Qwen3.8-27B (Alibaba) — Apache-2.0
  • This quantized version: Apache-2.0 (ArtomYuan)

This is a third-party community quantization (not an official Qwen release), not affiliated with Alibaba / Qwen. Provided for research and learning; use is subject to the base model license (Apache-2.0). No warranty is provided.

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