DS V4 on single b300. only 770 tok/s batched in vLLM

Explain Like I'm Normal

A developer testing DeepSeek V4 performance on high-end B300 hardware discovered significant throughput bottlenecks with standard vLLM configurations. The investigation highlights that advanced MoE kernels often require multi-GPU setups to hit peak efficiency, and that speculative decoding can actually hinder performance on saturated batch jobs. This real-world benchmarking serves as a guide for builders trying to scale high-throughput reasoning models on restricted hardware footprints.