A:AnswerThere should be a manual for your motherboard that depicts where to plug in your 24 pin and 8/4 pin connector, as for the pcie devices if your GPU requires external power you will typically have a slot for it near the back of the card
A:AnswerThis completely depends on your mother board, peripherals, expansion slot devices, and CPU power draw, this PSU is sufficient for most computers in the market unless your using enthusiast parts and configurations in which case you will definetely want to double/triple check your power consumption.