ROCmFPX GGUF Quants
Collection
Hybrid q4/q8 ROCmFPX GGUF quants. Requires the ROCmFPX fork of llama.cpp. • 4 items • Updated • 1
ROCmFPX Quantize Playbook
A field-tested, agent-ready playbook for producing ROCmFPX hybrid GGUF quantizations
(q4_0_rocmfp4_fast / q8_0_rocmfpx) with the
ROCmFPX fork of llama.cpp — fully CPU-only,
from either pre-quantized GGUF repos (e.g. Unsloth BF16) or raw HF safetensors.
The complete guide is in rocmfpx-quantization-guide.md.
Hand this repo (or just that file) to a coding agent together with a Hugging Face link and a
recipe, and it can reproduce every step below.
What it covers
- One-time CPU-only build of
llama-quantize/llama-gguf-split+ Python conversion deps - Workflow A: source repo already has BF16 GGUF shards (e.g.
unsloth/*-GGUF) - Workflow B: raw safetensors →
convert_hf_to_gguf.py→ BF16 GGUF - How to discover routed-expert tensor names per architecture (regex lookup table)
- Dry-run verification, shard merging, and output validation
- VRAM-fit hybrid recipe (q4 bulk + q8 sensitive) derived from Unsloth Dynamic tiers
- Cheatsheets, timings, and gotchas (regex anchoring, MTP auto-protection, gguf-py version trap…)
Validated runs
| Model | Recipe | Result |
|---|---|---|
| Laguna-S-2.1 118B-A10B | q4 experts / q8 rest | 224 GB → 61.6 GB (4.39 bpw) |
| Qwen3.8-27B | pure q8 and 16 GB hybrid from UD-Q4_K_XL tiers | 26.9 GB (8.25 bpw) / 16.4 GB (5.15 bpw) |
| G4-MeroMero-26B-A4B | q4 experts / q8 rest + mmproj | 50.5 GB → 14.0 GB (4.64 bpw) |
Timings on a 64-core CPU box: 118B MoE ≈ 8 min, 27B dense ≈ 1 min, 26B MoE ≈ 3 min.
Related
- Quant format project: https://github.com/charlie12345/ROCmFPX
- Companion model collection: ROCmFPX GGUF Quants
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