These Dual PSU Power Cable's are great for combining 2 power supplies for a mining rig - connect the dual cable to the motherboard, connect power supply 1 to the header which powers the motherboard, and power supply 2 to the power on header, allowing power supply 2 to start at the same time and be used for powering extra graphics cards.
These are 30cm (1 foot) long.
Ideal when high wattage power supplies are too expensive or difficult to source, run two lower wattage power supplies with this cable.