Qwen3.8 125B (6B active) Flash-Next

User reports Qwen3.8 Flash-Next at around 50-60 t/s decode with 1300 t/s prefill on a dual RX 7900 XTX system. Setup is Strata with a Q3_K_S GGUF and Q8 KV cache, running on the rest of the system while a Qwen3.8 27B Q4_K_XL model with 131k context and Q8 KV sits on the second card behind the chipset at gen3 x4. The 27B gets around 40 t/s decode and 700-800 t/s prefill. An unused flag raises Flash-Next prefill to about 2300 t/s but makes inference unstable, and a layer split keeps decode the same while bringing prefill near 3000 t/s. User is experimenting with pi/hermes agent setups and is not satisfied with how the two models work together.