Yep. I looked this up yesterday and apparently the processor had a 16bit interface whereas the DX version was 32bit. It makes sense though, my cousin was always a bit ghetto.I had 'Computers for Dummies' in this era. All I remember from it is 'SX stands for STINKS. Only get DX'.
We didn't get our first PC until years later. It was Pentium II 233 Mhz with Windows 95. It came with a free copy of Age of Empires.