I got this PC from my dad when he upgraded in like December ish. I've been running Kubuntu on it and just using it like a sort of general purpose desktop for me and my wife, but I've got a hankering for some tinkering and feel like it has more potential, so I'd love some project ideas!
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If you want to get into running a home lab, this world probably be a nice start. So throw proxmox on it and host all the services you want (in containers or VMs). Media server like jellyfin, maybe a nextcloud, storage/Nas services, automate your home with home assistant.
It has a relatively large amount of memory for that generation of system, but also will probably not exactly sip power for the performance your getting. So if power is expensive where you are, think twice about it.
What is the benefit of running it in Proxmox rather than just containers on bare metal?
Depends what you want to do. If you want only docker containers, it's the wrong tool. If you want to run a mixture of VMs and LXC containers, it's literally a management interface made for it. So it's pretty good at it.
You can migrate without downtime from one proxmox host to the other
Convenience, time saved.