I have a couple of old HP workstations left over from a web dev biz.
The best one is a Z440 Xeon E5-1650 v3/212B MOBO/128GB DDR4 RAM/1TB SSD/700w PSU/Quadro K2200 GPU
I also have a couple of Quadro M6000 24GB DDR5 GPUs with extra PSUs laying around.

I was gonna use it as a simple PLEX server, but was wondering if the server board with 2-PCIex16 slots is worth installing the extra GPUs for SD/Flux/LLM?
What could I upgrade on this rig that will extend it's life and not break the bank?