Qwen3.5-2B — ROCmFP4 / ROCmFPX GGUF

First ROCmFP4/ROCmFPX quantization of Qwen/Qwen3.5-2B. Four quants, built from the Hub BF16 GGUF (no re-conversion), each individually verified on real hardware.

Built for AMD Strix Halo (gfx1151) — Ryzen AI MAX+ 395, 128 GB unified — with the ROCmFPX llama.cpp fork.

⚠️ Needs a ROCmFPX-capable llama.cpp build. These will not load in stock llama.cpp / Ollama / LM Studio.

Variants

file ftype size token_embd decode correctness
Qwen3.5-2B-Q4_0_ROCMFP4_COHERENT.gguf 102 1.12 GiB Q6_K 106.44 t/s 3/3
Qwen3.5-2B-Q6_0_ROCMFPX_AGENT.gguf 114 1.68 GiB Q8_0 75.05 t/s 3/3
Qwen3.5-2B-Q8_0_ROCMFPX.gguf 111 1.83 GiB Q8_0 77.38 t/s 3/3
Qwen3.5-2B-Q8_0_ROCMFPX_AGENT.gguf 115 1.85 GiB Q8_0 76.77 t/s 3/3

mmproj-BF16.gguf is included — required for image input (-fa off).

Which to pick: the 4-bit (102) — fastest and smallest, same answers as the 8-bits.

⚠️ Q6_0_ROCMFPX_AGENT (114) is the weakest choice here: larger than the 4-bit and slower than the plain 8-bit. The AGENT recipe raises speculative-draft acceptance, and Qwen3.5-2B ships no drafter, so that benefit cannot apply. It is included for completeness.

Measured — not estimated

Hardware: Ryzen AI MAX+ 395 (Strix Halo, gfx1151), 128 GB unified. -ngl 999 -c 4096 -fa on -fit off. 300 tokens, warm-up discarded, median of 3.

ftype run 1 / 2 / 3 median spread
102 107.0 106.44 105.46 106.44 1.015
114 76.17 75.05 74.83 75.05 1.018
111 77.38 77.78 76.92 77.38 1.011
115 76.77 76.47 77.04 76.77 1.007

No MTP/EAGLE drafter ships with this model, so these are the deployed numbers with nothing left on the table.

Head protection

Qwen3.5-2B has tied embeddings — there is no output.weight tensor, so --output-tensor-type is a silent no-op and --token-embedding-type is the only flag that protects the head. Audited by exact tensor name on every artifact.

   1202487328  Qwen3.5-2B-Q4_0_ROCMFP4_COHERENT.gguf
   1807376416  Qwen3.5-2B-Q6_0_ROCMFPX_AGENT.gguf
   1969115168  Qwen3.5-2B-Q8_0_ROCMFPX.gguf
   1991397408  Qwen3.5-2B-Q8_0_ROCMFPX_AGENT.gguf

Credits

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