Qwen3.8 27B Swift-1.5

User reports Qwen3.8 27B (Swift-1.5 fine-tune, IQ3_XXS GGUF) at 70 t/s on an RTX 4080 16GB with 81920 context, using MTP plus n-gram speculation. Setup is llama.cpp (llama-server CUDA build in WSL2/Debian) with q8_0 KV cache, flash attention on, all layers on GPU, and 14.9 GB of the 16 GB VRAM used. With n-gram only the user got 45 t/s at 204800 context. They note MTP was worth the tradeoff and could grow context further by dropping MTP or allowing spillover into system memory.