It seems Linux simply does not have the power options that Windows has, such as hibernation, sleep mode, fan control, AMD cool and quiet, and if it does have them they're usually hard to implement (at least compared to windows) or they cause problems. It seems I've seen a lot of problems with APCI. (In fact, when I googled "Linux" and "sleep" I got a lot of people who had nothing but problems with it, such as here and here.) Plus, the monitoring tools aren't as good. I use superkaramba, but it was somewhat difficult to install and I had to go looking for the good monitoring tools. I also think Linux users have a tendency to be people who leave their comptuers on all the time, as Linux takes a long time to boot.