Doom 3

I think it was 1.5 ghz

anyway, I just played this game and even though its at 640x480 with lowest quality, it still looked great! The suspense is awesome I really like the way they scare you with all those monster just appearing out of nowhere and then when your screen suddenly turns red, and well I'm not going to spoil it. GG

Yeah, that was part of the first ones, too; there were always monsters appearing from portals when you'd enter certain rooms.