144hz Refresh Rate Issues Asus vg278HE

So I recently picked up this monitor for some sweet 144hz gaming. Used it for a while at 144hz and it worked perfectly. Recently hooked up a second monitor and noticed a drop in frames. Went to check my advanced resolution settings and for some reason my monitor had defaulted to 60hz. When I tried to bump it back to 144hz I get this weird flickering/artifacting going on but it works great at 120 hz. I am using the dvi cable that came with the monitor and I'm running a gtx970 overclocked to 1430hz gpu and 7600 hz memory. I get this effect when I default my gpu to it's factory oc settings so I'm not sure what's going on here. Is it my gpu or do I need a new dvi?

Cheers
 
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