Computer freezing randomly due to browser usage

Hello, I have just build a new pc, and everything seems fine. Even overclocked from 3.3 to 4.5. Ran Prime 95 for 12 hours and totally stable. But for some strange reason when I use the web browser such as Firefox and Chrome my computer just freezes randomly. It could freeze in 1 minute or it can freeze in 10 hours. It's really bugging me. I'm not sure if its driver problem or hardware problems. (Kind of a newbie here).
If its hardware problem please tell me which part so I can RMA it as soon as possible.
Here are my computer spects. Please help me out, Thx =).

CPU: i5 2500k sandy bridge
Mobo: ASrock p67 extreme 4
Ram: g skill ripjaws x 8gb 1600mhz
GPU: msi twin frozr gtx 560ti
HDD: samsung spin point f3 1tb 6/gb/s
PSU: 700w ocz modxstream
4 answers Last reply Best Answer
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  1. Wait no it doesn't freeze when cpu is not overclocked. So could it be my CPU? But it can also be my motherboard... I'm so confused. Any Ideas?
  2. Best answer
    your over clock is not stable.... back it down a pinch.
  3. Best answer selected by bodrizzle.
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