Ornith-1.5-35B-A3B ROCmFP4

ROCmFP4 quantization of Ornith 1.5 35B-A3B for AMD Strix Halo (gfx1151) and RDNA 3.5 GPUs, produced with the Q4_0_ROCMFP4_STRIX_LEAN preset (FP16 embedding/norm preservation, nextn MTP head kept at q8_0).

Quantization Details

Property Value
Quant format Q4_0_ROCMFP4_STRIX_LEAN (ROCmFP4)
Bits per weight 4.29
File size 18.16 GiB
SHA256 b42fb74cd32ce3ab5fc0b10214ae7b4030d852f49b749dcdd0e5ad6b35e1510f
Vision projector mmproj-Ornith-1.5-35B-BF16.gguf (0.84 GiB)
Projector SHA256 d9ce31026d1cb1f3f8d5152e2e2a014d9d2b302b6c93a7dc07bb0a0487f52837
Max Context 262,144 tokens (256K)
Source Ornith-1.5-35B-A3B-GGUF Q8_0 (allow-requantize)
Notes MTP head tensors preserved at q8_0

Measured Performance (AMD Ryzen AI Max+ 395, Radeon 8060S, Mesa RADV Wave64)

Configuration Decode
ROCmFP4 bare decode 76.9 tok/s
Q4_K_M baseline 71.5โ€“71.7 tok/s
ROCmFP4 MTP (K4 p0.0) 35โ€“50 tok/s (net loss โ€” keep MTP disabled)

ROCmFP4 is ~7.5% faster and 16.7% smaller than stock Q4_K_M.

Serving

HaloFPX (Text + Vision)

halofpx pull downloads and verifies both the ROCmFP4 weights and BF16 vision projector:

halofpx pull ornith-1.5-35b
halofpx serve
halofpx load ornith-1.5-35b

halofpx list reports model-weight and vision-projector readiness separately.

Direct llama-server Vision

llama-server \
  -m Ornith-1.5-35B-A3B-ROCmFP4.gguf \
  -mm mmproj-Ornith-1.5-35B-BF16.gguf \
  -ngl 99 -c 131072 -fa on --no-mmap

Full 256K Max Context (Strix Halo 128GB UMA):

llama-server \
  -m Ornith-1.5-35B-A3B-ROCmFP4.gguf \
  -ngl 99 -c 262144 -fa on --no-mmap

Multi-Slot / Conservative Memory (131K Context):

llama-server \
  -m Ornith-1.5-35B-A3B-ROCmFP4.gguf \
  -ngl 99 -c 131072 -fa on --no-mmap

Note: speculative decoding (MTP, --spec-type draft-mtp) is not recommended on this model (hybrid linear-attention MoE: ~16% draft acceptance, net throughput loss). Use bare decode (default --spec-type none).

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