Question: atx 12v what is it?
Answer: 8PIN ATX 12V. Connects to the motherboard EPS 12V socket. Provides additional power to the CPU. 4+4 Pin ATX/EPS. A hybrid of the 4 PIN ATX12V and EPS 12V connectors that can be split in half or combined to accommodate either the EPS 12V Socket or the ATX 12V socket.