There is no industry-standard definition of mid-loss, low-loss, and ultra-low-loss. It is good practice to start from the loss budget analysis to select which type of PCB material is needed for the system. Megtron-6 or other types of PCB material with similar performance as that of Megtron-6 are commonly used in PCIe 5.0 server systems where the distance from Root Complex pin to CEM connector exceeds 10″.