In short: use latest drivers, and try lowering refresh rate.
(Remember, Displayport is required)
If flickering is still noticeable, try some of the tips here:
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.... otherwise it might be unavoidable, as per this article:
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... in which case, might as well go max refresh rate and disable gsync... tearing at 144Hz is nowhere near as bad as it was at 60Hz back in the day, and better than eye-straining flicker.
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