Heres some specs I found for my pc, I guess it was built with a Pen. 3 and I have 192mb of RAM so it has had 1 RAM upgrade. I also found a stick of RAM at a buddies house in an old computer that would fit I think so I'm gonna try that.
Dell Dimension XPS T600r
Pentium III-600E CPU, 128MB of SDRAM, 256KB L2 cache, 20.4GB hard drive, Windows 98 SE, NVidia TNT2 M64 graphics card with 32MB of SDRAM