Do you have a difficult time trying to figure out what size power supply you'll need for your next build? With so many variables in play, it's no easy task, yet it's critical you get it right. Overshoot your power needs and you'll end up wasting money on a larger PSU than you need, potentially depriving funds from other parts of your build. But sell yourself short and instability could rear its ugly mug. The online eXtreme PSU Calculator is a great starting point and it's just been updated.