Nvidia GTX 960 Lower FPS If Overclocked

I am trying to over-clock my EVGA NVIDIA Geforce GTX 960. I am using EVGA precision X to do so. Whenever I try changing the base clock even a little I instantly to 1/4 of the original performance. I have tried tuing up the voltage and still no change. If I try to over-clock then revert the settings back to normal I still get a lowered performance its only on reboot that it restores the performance. The temperature doesn't increase if I tu up the base clock or the voltage, its as if when I try to adjust it all it does is reduce the performance.

Please Help!

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