text: should i change my power source unit to at least 400w since im trying to upgrade? my current pc has a 200w psu that needs to be changed and i was wondering if instead of getting another 200w psu i should get at least 400w, will my pc work without problems since the power source is double the power??  i also want to get another motherboard and cpu so is it better to just get more watts? 400 it's a minimum this days .. if u planing to upgrade renew ur sistem remember that the new hardwares are using a lot of eletricity ... so if u dont want to have problems which u definettly will if u use a 200psu go for the 400 or better .. u can use an 600 w psu .. the bigger the better but that only if u'll use 2graphic card's, 4hdd's, 3dvdroms etc :p