How much processing power do you need to run a vanity generator/miner today? I would guess it will use lots of electricity for the task.
You can use any device, but some are faster than others. My A8-7410 laptop CPU searches through ~200kkeys/sec, my Ryzen 5 1600 @ 3.7 GHz searches through ~2Mkeys/sec, and my GTX 1060 3 GB searches through ~40Mkey/sec.