well am using an 1900xp @12x143 i also have an 1600xp i got for a good price off a buddy, i can only seem to get 143 fsb stable whith my 1900xp on an asus a7v266/e mother. now i never tried the 1600xp its just bin sitting here for a while but after reading all of the posts saying how good the 1600xp is it worth me puting it in and trying it.how do i know if i have a good 1600xp chip, can i go higher than 143 fsb whith a 1600xp even whith my pc2100 ram and my a7v266/e mother you advice whould be great and maybee ill rip out my 1900xp tonight.