Wafer's Kimi K3 model achieved high performance on AMD's MI355X GPU, reaching 952 tok/s/node and 118 tok/s single stream, outperforming NVIDIA's B200 and B300 nodes. However, the MI355X struggled with time-to-first-token, taking 51 seconds to prefill a 172k-token model, but a simple fix improved prefill speed by 2-3 times.