get real temp or similar and test the system at idle for an hour the under stress (use prime95 small fft's max heat). If these results are too high (65 celcius) you need better cooling to overclock, if not restart the computer and go into the BIOS. In the BIOS there will be an advanced bios page or MIT or similar which will contain information about the cpu bclk and other information. You start overclocking by raising the bclk on the cpu by 1 or 2 at a time then running the settings using prime 95 to stress test it, if prime fails for whatever reason the overclock is unstable. this means you should lower the bclk t the last known working settings that passed prime 95. When you think you have the highest overclock possible run prime overnight or around 8 hours to double check that it is fully stable