The pc was neither. My 486sx 33mhz. with 8mb. ram could barely run Doom. Doom crawled as well on a 486dx 66mhz with 4mb of a friend of mine.
Ive run Doom without any issues on a 33MHz 386 and 8MB ram. Ive had friends back in the day that ran it on even lower at decent rates.
I don't know what you did wrong, but im 100% sure it ran fine on my machine since I played it alot.
