Originally posted by rusty c
You don't have to unlock the xp1600. My 11 year old son has his up to 1900mhz (stable) and its not unlocked. Good case cooling, good HS and fan and PSU are most important. Go for it.
You forgot to mention ram. running 180+ FSB requires soom good ram, especially if you intend to keep all the timings tight. The only reason I unlocked mine is because I'm running pc2100. They're excellent sticks that can do up to 185 at cas2 but I have to run alot of voltage through them to keep it stable so unlocking gave me the option to play around with various settings.