Sun IPX "server"?
The Sun IPX was never meant to be a server, but a tiny workstation. Typical configuration was something like 40MHz CPU, and 16MB or 32MB of RAM. It came in a tiny "lunchbox" case. (about 1 foot by 1 foot by 8 inches tall).
I doubt a PC era hardware was more powerful, but almost certainly, SunOS was 1000 times more stable and capable then anything running on a PC at the time.