Ok. Here's how I do it for those who didn't really get what I said earlier. FYI, I'm using K50AB purchased from All-IT.

Step 1: Update Windows Vista completely (I'm using Vista Ultimate 32 bit).

[B]Step 2: Install AMD/ATi drivers from official website (not Asus website). Other drivers, use the included driver CD to install all.[/B]

Step 3: Switch from HD4570 to HD3200 via ATi driver inside Windows.

Step 4: Go to Sleep mode via Start Menu.

Step 5: Wake up from Sleep by pressing any key or mouse click.

Step 6: The fan will now be spinning at full speed!
(Note: You can change to HD4570 back now for gaming, and the fan will still be running at full speed. However, if you plugged/unplugged your power supply, you need to restart Step 3 and onwards)

Key benefits:
- Temperature at idle is as low 36 degrees Celsius. You will realize even the hard disk and top-right-hand side corner is no longer warm!
- Temperature at gaming is still very low, since the Asus K50AB is designed to cool all parts of the laptop (comprehensive-exhaust system).
- The air that the fan is blowing out will not be as hot as before as the fan speed can push much more air out, thus preventing heat build-up.
- Longer life for your laptop components and battery.