This might be a little late(I hope not).
You have to know that you should only overclock your CPU/GPU little by little and each time, you need to run a torture test on your computer! (-> use this Program for testing:
Prime95).
Increase your Clock speed and multiplier by let's 5 and test it afterwards(the torture test should run at least 30 minutes), if it was too much, the test will give you a fatal error without frying your system. Then, you need to test around, ofc, lower both values until your system runs stable w/o error in the test, then try to increase only one setting. That way, you can get the maximum out of your system without destroying it.
Make sure that you check your CPU Temp and vent speed as well! For Intel, the maximum temp should be 60-70C and for AMD 55-70C(later one will be less stable when being over 60C!). If possible, your vent should increase it's speed to max if your CPU reaches the lower max temp limit!
But be warned! Overclocking will shorten your CPU lifetime! Also, your computer will use more electricity and it might be louder than usual. Finally, some games and programs won't work better with an overclocked system, TESIV: Oblivion is an example which might even cripple your computer.