Nemotron-3-Puzzle-75B-A9B — GGUF

First GGUF release of NVIDIA's Nemotron-3-Puzzle-75B-A9B (hybrid mamba2/attention/latent-MoE, 75B total / 9B active, 262k context, MTP draft head).

Converted from the official FP8 checkpoint (weight scales absorbed at conversion — no double quantization), then quantized from the Q8_0 master with an importance matrix.

Files

file size note
Puzzle-75B-A9B-Q8_0-0000X-of-00002.gguf 77.7 GiB (2 shards) master, near-lossless — point llama.cpp at shard 00001, the rest loads automatically
Puzzle-75B-A9B-Q4_K_M-0000X-of-00002.gguf 48.1 GiB (2 shards) reference k-quant, fastest decode
Puzzle-75B-A9B-NVFP4.gguf 45.0 GiB experts NVFP4, everything else Q8_0
Puzzle-75B-A9B-UD-IQ4-XL.gguf 41.6 GiB experts IQ4_XS; attn Q8_0, ssm/shexp Q6_K, ffn_latent Q8_0
puzzle-imatrix.gguf 0.2 GiB reusable imatrix (calibration_datav3)

Requirements

Not yet supported by mainline llama.cpp — needs per-layer heterogeneous MoE arrays and the 2-sub-block MTP head. Use the puzzle-port branch until the PR is merged: [PR_LINK]

Measured (Strix Halo 128GB unified, Radeon 8060S, -ngl 99; PPL = wikitext-2 test, 24 chunks)

quant PPL decode t/s prefill t/s backend
Q8_0 5.325 10.2 189 Vulkan
Q4_K_M 5.404 19.9 238 ROCm
UD-IQ4-XL 5.377 17.7 211 ROCm
NVFP4 5.383 16.6 243 ROCm

All three 4-bit variants sit within noise of each other on PPL (±0.08); pick by speed/size trade-off.

⚠️ On Strix Halo (gfx1151) use the ROCm/HIP backend for the 4-bit quants: Vulkan decode collapses to ~2.7 t/s on this model's MoE (mul_mat_id slow path). Q8_0 exceeds the ROCm allocation limit → run it on Vulkan.

MTP speculative decoding (--spec-type draft-mtp) loads and drafts correctly, but is currently slower than plain decoding (~13 vs 16.6 t/s): llama.cpp cannot yet roll back mamba2 recurrent states, which throttles draft attempts. Leave it off for now.

Notes

  • Reasoning model: llama-server parses the thinking channel natively.
  • AI-assisted work; everything reviewed and validated end-to-end on my hardware.
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