Possibly depends alot on case airflow, ambient temps and your particular processor. I would bump it about 100 MHz at a time test it with a 10 to 15 minute stress test for stability and heat. If under load for 15 minutes your temps get over 70C go back a frequency step you also might try under volting it slightly to help keep temps down and just doing a clock multiplier stepping. Your particular processor is probably the biggest variable here as these psuedo apu's appear to be all over the board when it comes to overclocking limits and stability.