My board (ASUS Rampage Formula, X48) has a CLR CMOS button on the back panel. Pressing it is supposed to clear CMOS. I was wondering if it REALLY is reliable and REALLY clears ALL CMOS settings as well as RTC clock. Or should I just use the age-old method of removing the battery for some time just to be sure? Which method is the more reliable one? And overall, in your opinion, what is the most reliable way to clear CMOS?