450watt

First of all these are my computer specs: Intel Core i3-7100 3.9hz Sapphire RX 580 nitro 4gb GDDR5 4GB DDR4 RAM GAMEMAX 450watt 80 + bronze. Yes, I know that the minimum PSU required by RX 580 is 500 watts, and when I plug in the gpu my monitor doesn't turn on at all, all my pc components...