Older hardware isn't always slower hardware.

Intel 6950X is unsupported. That's 10 cores at 3.5GHz. It's about 10x faster multicore and 2x faster single-core than a modern, supported Intel Celeron N4500.

Moore-style scaling where chips are faster (rather than just denser) ran out a while back. Expensive computers from a decade back beat cheap computers of today. A modern 20-core PC is perhaps 1/10th the CPU cost as compared to when the 6950x came out, but not a lot faster.

If that 6950x was maxed out to 128GB RAM and set up with a decent GPU, it can be a very good system.

That's among the oldest processors not supported, but many computers with somewhat newer CPUs don't work either due to motherboard / BIOS issues.