Alright, I have (or...will have in a few days) an Athlon XP 2100+. My mobo (ECS K7S5A Pro, Rev 5.0) has 2 DDR slots, and 2 SDRAM slots. What kinda' RAM would I wanna use? I've always been using PC133, cause this is really my first 'fast' computer. Anyways. I don't get the whole PC*** thing, so, anyone care to help me out? 