Summary
User reports Qwen 3.8 Next at ~10.1 t/s on an RTX 3090 capped at 250W, with a Xeon e5 2690v4 and 96GB DDR4 RAM.
Setup replaces the N-gram layer with Q8 precision on top of an IQ4_XS quant.
The user reports no meaningful speed penalty from the change.