My Dell setup is all second hand enterprise gear I bought just before the price rises. Dual Xeons and 512GB of RAM which burns a lot of power and has approximately 800% more computing power than I need. But it is fun to watch the blinking lights.

My other setup is made up from old PC hardware I had laying around. Basically just collected the case that best suited lots of hard disks, the highest rated PSU, the best matching sticks of RAM etc... Probably should have cleaned the case out properly in hindsight. Because its all SATA / SSD / NVME it actually draws basically nothing. The spinny drives all shut down when not in use - which is most of the time. The SSD cache has more than enough space to keep up with daily activities.