Qwen3.8 125B (6B active) Flash-Next
on AMD RX 7900 XT · Strata · 32,768 ctx
Summary
User reports Qwen3.8-Flash-Next at 54 t/s decode and 1,100 t/s prefill on a single AMD RX 7900 XT with 20GB VRAM plus 96GB system RAM.
Setup is Strata with Huihui UD-IQ4_XS quant (2/3 experts IQ3_S, rest Q8+) and KV streaming for the full 262k context window, using auto:32768 context on ROCm 10.1.
User is happy with the result but asks for advice on speeding up prefill further.