in my personal experience , another problem is AMd Dual Core Systems.. and the 'Cool 'n' Quiet' system.. which is disabled from access via the bios on some systems .. namely HP's
This causes the speed up / slow downs and other drama's that only us AMD users experience.
only way to counter it is by using a 3rd party Bios Hack (
Dangerous?) which allows this system to be enabled / disabled once more.
btw: it works..