Building my first homelab

Hi everyone, I'm a fresh grad software developer and I plan to create software to do testing. I also want to use the servers to learn about infrastructure, networking, and system administration hands-on.

I recently came across two Dell PowerEdge R720s going for $350 SGD each. Each unit comes with dual Xeon E5-2670 CPUs, 64GB RAM, and dual power supplies. I'll be adding 2x 1TB SATA drives per server.

I want to have two servers as it will let me practice things I can't do on a single machine, such as PostgreSQL primary/replica replication, scheduler/worker separation, and proper network segmentation between hosts.

I would like yall input on them.

Especially on:

The E5-2670 still a reasonable choice for a homelab running containerized workloads in 2025?

Any tips for first time R720 owners things to check on when buying a 2nd hand one.