I had similar issues with my Asus RX480 Dual OC, solved mine by changing the cable even though it worked perfectly fine with the 7970 i had in previously. The cable i'm now using come with a spare Now TV box, but with 1440p and FreeSync you may need a Vesa certified cable.
hmmm i will try a different cable etc but i am using the cable sent with the monitor, should be good enough but we will see tonight
			
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