The MasterBox Q500L supports a standard ATX motherboard and PSU in a highly compact layout. With the same exterior dimensions as the MasterBox Q300L, support for a standard ATX motherboard was made possible by maximizing the usage of internal space.Although the PSU is mounted by default at the top/front of the chassis, the mounting bracket allows for the repositioning of the PSU depending on form factor. For instance, if a mini ITX motherboard is used instead of an ATX in the MasterBox Q500L, the PSU can be mounted in the conventional position of the bottom, rear to allow for increased front panel ventilation and configuration options.Across the Q series, the movable I/O panel and support for different orientations are also featured on the MasterBox Q500L. Thermal performance is dependent on the build itself, with the exterior fully perforated to offer plenty of options for cooling configurations.