How many watts does a CPU plus GPU mining PC actually pull?

A typical home mining PC running one mid-range GPU and a modern six- or eight-core CPU pulls between 250 and 400 watts at the wall under sustained load. The GPU is usually the biggest share, drawing 130 to 220 watts depending on the model and any power limits you have set. The CPU adds 65 to 125 watts when fully loaded, less if you are only running it at partial utilisation. Motherboard, RAM, drives, and case fans together rarely exceed 30 watts. If you add a second GPU you can expect another 130 to 220 watts on top. Over a month of continuous mining, a 300 watt setup uses about 216 kilowatt-hours, which gives you a concrete number to multiply by your local electricity rate when you plan your budget.