How do i overclock my a10 7800

[Muath_]

i want to overclock my cpu, could you guys help me?

here is a pic http://imgur.com/JQKywHi

so i found this thing called AMD overdrive. My speed is set at 3500 but the slider only goes to 3900 why is this? and how much should i increase my voltage? http://imgur.com/4ZjUb2W

 

[kirkgun]

Have you tried msi afterburner?