Embodiments of systems and methods for high-speed Out-of-Band (OOB) management links for inter-Baseboard Management Controller (BMC) communications in High Performance Computing (HPC) platforms are described. In some embodiments, an HPC platform may include: a system BMC; and an accelerator tray comprising: (a) one or more managed subsystems, (b) a tray BMC coupled to the one or more managed subsystems, and (c) a Field-Programmable Gate Array (FPGA) coupled to the tray BMC and to the system BMC.