Villager sim game built locally on 16GB VRAM with Qwen3.8-27B Q3 quant at 75 tok/s

Fancy-Snow7 · reddit · 2026-09-06

A dev built a playable villager simulation game POC with Qwen3.8-27B-UD-Q3KXL.gguf fully offloaded on a 16GB RTX 5070 Ti, hitting up to 75 t/s generation and 1700 t/s prefill with 96k context on Windows. Key lessons: don't fear Q3 quants or KV quantisation — a higher quant forcing CPU offload drops speed to 5-20 t/s, while high speed lets you fix issues with follow-up prompts; MTP/draft caches can now be quantised with kvarn, saving VRAM versus qxx quants. Development was incremental feature prompts rather than one-shot, with minimal hints (modular code, no magic numbers) and almost no code reading. Context overflow was managed with handover documents and the pi-observational-memory extension. Features include a large scrollable map, minimap, weather/seasons, day-night cycle, resource storage, houses, and death from hunger or cold.

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