PowerNow! is for Mobiles installed in notebooks.
If you are running your 850 Duron Mobile in a Desktop then what you want to install for software is CrystalCPUID from http://crystalmark.info/?lang=en
CrystalCPUID will allow you to vary the multiplier of your Duron, from it's max of 8.5x down to 3.0x and back up again.
And do it from within Windows.
Then you can play with the multipliers to your heart's content... like this...
Here is my new PCChips M848A' ">http://img.photobucket.com/alb...2_T-2-3-3-6-2_M848.jpg v2.1, with a 1700+ @ 2411 MHz, and my trusty old PCChips M810L' ">http://members.lycos.co.uk/mmm...00MHz_Sandra_tests.jpg v7.1A, with a Barton 2500+ @ over 3500+. Some of my fancy cars are on this pag