480 plots per day 
~ 3min GPU bladebit_cuda compressed plots C0-C9
~ 15 sec copy to temp storage
~ 4m 30s copy to HDD from temp storage
With that plotting speed, you need only 3 sas drives to keep up with plotting production throughput.
Chassis: Dell T620 12 Bay LFF
Processors: 2x (2.80GHz) 10-Core Intel Xeon E5-2680V2
Memory (RAM): 768GB (24x32GB) DDR3 PC3 - 1066Mhz
GPU: RTX 2080 Super
OS: Proxmox 7.4 → Ubuntu 22.04
Using 400GB of Ram as temp storage to plow from.
Turns out ssd was a bottleneck because of proxmox virtIO layer.
GPU is chilling under 50% load, I’m using SAS drives so each has a writing speed of about 200-250 MB/s
Except for GPU and HDD’s plotting server cost me like 700$.
While plotting power consumption about 400W - 430W with 12 drives.
I would say it damn good budget setup
Happy plotting!