If you need to know, my lowest spec PC was my 1st PC: IBM XT.
Specs:
CPU: Intel 8088 @ 4.77 Mhz
RAM: 128 KB
HDD: Seagate ST-412 (10 MB)
PSU: 130W
GPU: none
FDD: 5.25"
ODD: none
OS: PC DOS 2.0
monitor: monochrome
mouse: none
speakers: none
Though, at that time, 25+ years ago, it was one of the best available. After IBM XT, following PCs i had were with better specs, e.g IBM AT, 286, 386, 486, Pentium I, Pentium II etc.