Running Qwen3.5/Qwen3.6 with NextN MTP in llama.cpp on one RTX 3090 Ti

Running Qwen3.5 / Qwen3.6 with NextN MTP (Multi-Token Prediction) speculative decode in llama.cpp — single RTX 3090 Ti GPU guide

A Reddit user posted a llama.cpp guide for Qwen3.5/3.6 with NextN MTP on one RTX 3090 Ti. It requires two unmerged PRs, #22400 and #22673; Qwen3.6-35B-A3B-MTP reaches 157 tok/s at 350W, 1700MHz, with q8 KV. The key reproducible detail is nextn=q8_0 quant override; missing it yields “////” output.

Why it matters: HKR-H/K/R all pass: single-GPU 157 tok/s is a strong hook, and the PR/power settings make it testable. Scope stays narrow because it is a Reddit guide using unmerged PRs.