Okay so I've sorted this issue out now and it was an embarrassing oversight on my part.
I had turned V-Sync on in the Vizard settings and presumed that the graphics card settings would be overridden. However, this was not the case and the GPU V-Sync settings was set to ALWAYS OFF. I turned it on here and everything runs smoothly.
Wanted to post the solution in case anyone else hadn't thought of checking the GPU hard settings, like me.
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