How do I change my APG from 8x to 4x?

[tommyboy]

I recently installed battlefield 2 and when I run it now (at radeon 9250) I have the popular problem of it freezing and crashing after the opening movie and the phrase "welcome to duty" or whatever. Anyway so after researching i learned what i needed was to change the apg from 8x to 4x, however I couldn't change it from the catalyst control panel but i also couldnt figure out how to change it from BIOS either.