> Nvidia recommends a much more powerful PSU than needed just in case. The two things to watch out for here are 1) Cheaper PSUs can't always actually hit thei

> Nvidia recommends a much more powerful PSU than needed just in case. The two things to watch out for here are 1) Cheaper PSUs can't always actually hit their claimed wattage, particularly not in real-world heat scenarios 2) CPU & GPU both use the 12V rail for their power, and not all PSUs can deliver all the rated wattage on the 12V rail. Any decent to good PSU won't have either of those issues, most list their rated wattage entirely on the 12V rails these days. So for example let's assume 250w for the GPU average and 120w for the CPU average (turbo & boost & all that). A 400w PSU could technically do that, particularly since if your only drive is an SSD your "accessories" are basically a rounding error. But if we take this 400W PSU for example: https://www.newegg.com/coolmax-i-400-400w/p/N82E16817159140 https://www.newegg.com/coolmax-i-400-400w/p/N82E16817159140 it can only deliver 300W on the 12V rail. Not enough. By comparison this EVGA 450W PSU can do a full 450W on the 12V rail alone: https://www.evga.com/products/product.aspx?pn=100-BR-0450-K1 https://www.evga.com/products/product.aspx?pn=100-BR-0450-K1 That's a 150W useful difference in this scenario even though the "rated" power only differs by 50W.