I know I can go to task manager and go to open resource monitor to view CPU and memory but how do i find out what power supply (want to know wattage but doesn't say on psu) and motherboard i have?
You open up your case and read the sticker on the power supply. There is no software to tell you what psu you have. You have to physically look for it. If there isn't, you probably want to get a new one that is a decent quality then.