Can't Overclock GPU

I'm been trying to overclock my GTX 970 ACX 2.0 SSC with MSI Afterburner, but whenever I change my core clock above anything more than around +50, Stress Tests run fine, but playing games like overwatch randomly lead to black screens and monitors flickering for a few seconds, which the game then crashes. This sometimes happens outside of gaming, even just on the desktop, where everything goes black. What is happening? Why can't I overclock?

Thanks for the help
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    Question from Plumss : "Can't Overclock GPU"

    Plumss said:
    I'm been trying to overclock my GTX 970 ACX 2.0 SSC with MSI Afterburner, but whenever I change my core clock above anything more than around +50, Stress Tests run fine, but playing games like overwatch randomly lead to black screens and monitors flickering for a few seconds, which the game then crashes. This sometimes happens outside of gaming, even just on the desktop, where everything goes black. What is happening? Why can't I overclock?

    Thanks for the help
    Reply to Rogue Leader
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