if you have APU + dedicated graphiccard make sure that you only use the APU under Linux and turn off the dedicated graphiccard. Otherwise it will heat up a lot.
Recently I read about a fedora user who had a notebook with Radeon APU. At first he didn't even know that in his notebook had a dedicated graphiccard too, but he wondered why the power consumption and heat was so high. And then he found out that he had to turn off the dedicated graphiccard.
The thread is somewhere in this forum I think, but it could be that it is a few weeks older.
The free Radeon driver should work pretty decent with this card. The proprietary driver has some advantatages, like better performance and efficiency, but as linux noob and for someone who doesn't play advanced games, and for people who use the newest Fedora releases it's generally better to use the default driver.