DeepSeek V4.1 Flash 763B

User reports DeepSeek V4.1 Flash at 23.3 t/s decode and 1,077 t/s prefill on a Strix Halo 128GB (Bosgame M5), fully resident in GPU memory with no SSD streaming. Setup is the user's Gufo fork with IQ1_M GGUF weights, a 112 GiB backbone in GPU memory, IQ4_NL Engram tables (103 GiB) read from NVMe, and a 4.6 GiB Q2_K/Q4_K drafter. The reported figure is plain decode; DSpark speculative decoding with prompt lookup reaches 28.0 t/s on mixed text and 65.3 t/s on repetitive text at depth 0. At 32K depth decode is 22.9 t/s with 993 t/s prefill, and at 128K 21.7 t/s with 700 t/s prefill. Eight concurrent users total 78.5 t/s, and editing a source file through prompt lookup gives 67.6 t/s. The user warns the setup needs the whole machine, leaving about 1.75 GiB of RAM with the drafter loaded.