The HDPlex H5 is a great fanless heatsink-case pc, able to cool a wide variety of processors. The case measures 15.3 x 16.9 x 4.3 inches (LxWxH). The H5 case is a heatsink that directs heat from the internal parts to the outside of the case through either 8 or 16 heatpipes. It is compatible with all motherboard sizes and processors with TDPs of up to 110 W. There is space for up to 4 2.5″ storage drives. It is compatible with graphics cards with TDPs of up to 150 W or other PCIe expansion cards. The case has a USB 3.1 Type C port and a power on/off button on its sides. It is compatible with external power supplies.