EDIT:
I see you're from the UK, do you have the HDMI output set to 60Hz?
..because the Nvidia display driver can default to the UK PAL 50Hz standard output, which will cause bad framerate when a 60fps signal is actually running at 50Hz, so you have to manually change it to 60Hz NTSC in the Nvidia control panel.
It's a once only thing, but you may need to change it anytime you update the display driver.
Edited by Ziggy100 (08/13/15 12:25 PM)
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