my friend is selling his pentium 4 3.0ghz northwood 800fsb to me for $60 but since my motherboard cant support 800fsb i'll have to underclock :| to 133x15 so will my current cpu celeron 2.8 perform worse than the p4 at only 1.9ghz? or is it worth it?? seriously short on cash cant afford new mobo :|