Multi-GPU (see GPU)
A multi-GPU is comprised of several individual GPUs. This technology can be used through interconnection to one graphics card or distributed to several graphics cards. In either case the individual GPUs communicate with one other to process and depict image data as quickly as possible.
Molex is a maker of plug connectors. The 4-pin Molex plug is commonly referred to as a Molex plug.
mm/H2O is a unit of air pressure. Other common units are millibars and hectopascal. For PC fans, these units describe a fan's ability to increase the air pressure of a closed volume by the amount indicated.
The mainboard or motherboard is a computer's primary circuit board. Other hardware components (RAM, graphics cards, etc) are connected to the mainboard using plug-in slots. The mainboard is what brings the individual components together so that they function as a computer.
Mini ATX (µATX, ITX, Flex ATX)
The Mini-ATX form factor represents a miniaturisation of the ATX form factor. ATX mainboards are dimensioned to roughly 300 x 250 mm, while Mini ATX mainboards are only around 280 x 210 mm. The current smallest mainboard features the Pico ITX form factor and measures just 100x70mm. To fit these smaller designs, power supplies are also offered in small designs. Examples of this include SFX and TFX power supplies.