I'm also a newbie into the computer world.
P75 - in a Olivetti PC, the only computer I've owned the I've not built myself.
P150 - Great speed increase since all the other parts is now too
P200MMX - Well, I got those MMX instructions
P233MMX - I friend bought my old 200MMX.
P2 266 - Problemfull sys, bad mobo.
P2 350 @ 466 - New CPU & mobo, now stable.
P3 450 @ 600 - Great CPU bad mobo (f.u.c.k.i.n.g ABIT!!)
T-bird 1,2GHz @ 1,3GHz - my main system now.
P3 800EB @ 840MHz - Well, I bought one for my second system, now I've one Intel & one AMD (The price was the same for those CPU's, a P3 800EB boxed costs the same as a OEM 1,2GHz T-bird, add a fan and It's still a big difference.)