I'm not that dense, luckily!
But my PC probably isn't up to the task of Doom 3. My "big rig" is a 2.8 P4 (Northwood) with an Intel mobo (865 chipset), 512 MB decent low latency memory- but no graphics card beyond the integrated one in the card. I never game on the PC, although one day I would like to outfit one of my machines for gaming (the internet PC is a weenie Celeron 2.7 Gig, 768 MG Ram, no graphics card
).
At any rate, I'm sure Doom will be much better on the 100" Da-lite screen or my B-room 32" Tosh.