Qwen3.8 27B

User reports Qwen3.8 27B at 80+ t/s generation and 1200+ t/s prompt processing on an RTX 5080 with 16GB VRAM, using CUDA unified memory to fit the model. Setup is llama.cpp with the Unsloth UD Q3_K_XL GGUF, 160000 context, q8_0 KV cache, flash attention, and MTP speculative decoding with ngram-mod draft. User asks whether Q3 quants are good enough for harness coding with opencode, pi, and qwen-cli, and notes this is the only quant that fits the whole model in VRAM.