Well you increase the FSB in small increments of 10-20MHz or so, and see if the setting is stable (i.e. if it runs windows properly). I would suggest that you dont go any highr if the temp touches 70degrees. Also, if you make a mistake in the BIOS, and do not know how to fix it, you will have to open the case and take the CMOS battery out and bac in again, to reset bios settings.