I actually did this with a laptop that was given to me. The hard drive was dead, so I replaced it with an ssd, and it's pretty peppy for a 5 year old laptop.

It's a Windows 10 PC - that considered old now? Was looking forward to some Win 2000 jury-rigged hackathon with some BIOS wizardry and converting to molex power etc. But nah, just some dodgy looking brit bumbling about.