Overclocking by itself doesn't mean anything, you have to make sure that its stable. Get a program called Prime95 and run the Torture Test (Blend). The program will stress your CPU and RAM and make sure they're stable. You might want to run the torture test sometime before you go to bed since you're going to need to run it for atleast 8 hours (unless it fails before that). If the test doesn't fail in 24 hours, then you can manually stop it and claim that its perfectly stable. If the test fails before that, then you have to take a pic and post it on here showing how long it took for the test to fail.
I doubt you're getting 2.4GHz on stock voltage so you probably need to run the test. If the test fails kind of soon, then raise the voltage by a little and try again.
Personally, I stopped the test at 18hours for me since I needed to use my PC for something and the test was hogging the CPU. My test didn't fail, I stopped it, so I'd say that after 16 hours you could stop the test, but if it isn't CRUCIAL that you use the CPU, then don't stop the test until after 24 hours.
What RAM do you have?