I had an old Compaq Evo D510 full-size tower/desktop convertible PC, from the Pentium 4/Windows XP era, that I wanted to upgrade. The machine long ago outlived its usefulness–its Pentium 4 CPU is less powerful than the average smartphone CPU while consuming enough power to be a space heater–but the case is rugged, professional looking, and long since paid for. So I thought it was worth dropping something more modern into it.
I chose the Asrock Q1800, which sports a quad-core Celeron that uses less than 10 watts of power and runs so cool it doesn’t need a fan. It’s on par with an early Intel Core 2 Duo when it comes to speed, which won’t turn any heads but is plenty fast to be useful, and the board can take up to 16 GB of DDR3 RAM and it’s cheap. I put 16 GB in this one of course. I loves me some memory, and DDR3 is cheap right now.