Getting stable with DeepSeek-V4-Flash-0731 on a single Nvidia B300

Findings DeepSeek-V4-Flash-0731 runs fast on a single B300. I spent $40 to learn, so you don't have to! There is a reproducible issue with "Breakable CUDA Graph" enabled that causes a FlashMLA/TMA assertion and crash (triggered by my usual 8 harbor agents on regex-log) Workaround was to disable the …