as i explained before l never had a laptop before and this is something i don't understand...and no its not at 800 when i need it.......when u read up....like i said its 644 80% of the time.
If its running 644 80% of the time, then it's running at 800mhz 20% of the time. The cpu runs at slower speed UNLESS you are running a cpu-intensive app(like video). Do you have a battery installed when you are running on the wall charger? Most of the time, unless you have both(batt&charger) in at the same time, the cpu will run slower speeds.
D/L MobileMeter: http://www.geocities.co.jp/SiliconValley-Oakland/8259/
and have it run on Startup(put it in your Startup folder). It can be fixed on the top of your screen and show freq/temp all the time.
If your cpu doesnt run at 800mhz all the time, that is a GOOD thing.