Qwen3.8 Flash-Next GDN-MSE, 1x v2.2.0, coding C1 median decode

User reports Qwen3.8 at 78.6 t/s on one NVIDIA DGX Spark (GB10 Grace Blackwell, 128 GB unified RAM, TP=1). Setup is vLLM with NVFP4 experts and MXFP8 dense/attention paths, FP8 KV cache, probabilistic MTP with 4 draft tokens, and a configured max_model_len of 262144. The figure is the mean of 6 boot-level means of per-pass median request decode rates, one request at a time, with a between-boot sample SD of 0.487 t/s; it is not pooled tokens/time or an end-to-end completion rate.