Ammo, then you just go to bios and select a CPU multiplier that is higher than original. Save, exit, machine reboots and you get a higher Mhz on bootup.
OTOH if you set the fsb/multiplier higher than your CPU/memory/motherboard/cooling allows, you save the settings, boot the computer but oops no post, dead computer

Sweat, adrenaline, checking of warranty papers..
Nah, no worries, find clear CMOS jumper from the motherboard manual, do the deed and with any luck your computer is back up and running. There is some percentage chance however that it STAYS dead, very small tho.
That is why you should make any changes in very small increments, boot after change, test, if stable, change some more.. etc.