enter
BIOs
select Load optimum setting
select f10 (save and exit)
reboot hit TAb then del enter
bios
now you should be at 333x7.5 and ddr3 at 1333 Mhz
set drive boot order ect but dont tweek anything
install xp
after complete install sp3 and current drivers should you clock your
ddr to 1600.
best results would be to install vista as ddr3 is better supported.
hope this helps.