10% is considered generally acceptable as a standard for air-cooled overclocking. You can acheive more, but the extra heat (from the extra voltage required to drive the CPU) will start to degrade the longevity of your CPU in an exponentially increasing manner.
Personally, I overclocked my 3700 when I first got it but dropped back when I realised that I didn't really need the extra speed. What I needed above all else was stability and a long life for the CPU (it has to last at least 3 years, before my next upgrade).
Personally, I overclocked my 3700 when I first got it but dropped back when I realised that I didn't really need the extra speed. What I needed above all else was stability and a long life for the CPU (it has to last at least 3 years, before my next upgrade).