• Allows a 24-pin ATX power supply to power a legacy 20pin motherboard. 

• Both ends of this adapter cable is 20-pin but connector is thin enough that it works with standard 24-pin PSU or 20+4 PSU  

(see the last 3 Installation Illustration Pictures)

Now you don't have to run out to purchase another power supply.

You can just use this adapter cable to make your existing standard

24-pin ATX power supply work as a 20-pin ATX power supply.