The HDPlex H1 is the best performing fanless heatsink-case mini pc, able to cool a wide variety of processors. The case measures only 8.8×11.3×2.7 inches (LxWxH). The H1 case is a heatsink that directs heat from the internal parts to the outside of the case through six heatpipes. It is compatible with Mini ITX and Thin Mini ITX motherboards and processors with TDPs of up to 65W. There is space for up to 3 2.5″ storage drives. Due to its size, it is not compatible with graphics cards or other PCIe x16 expansion cards, but may be compatible with a single slot PCIe x1 or x4 expansion card when equipped with a Gigabyte H170TN motherboard. The case has 2 USB 3.0 ports, a power on/off button, and a 4-pin molex power connector on its left side. It is compatible with external power supplies.