I'm assuming this issue is happening at stock speeds?
if so something to try here... I noticed that this motherboard for no reason will get wonky with advance ram timings. Try dropping in your other cpu copy down all the timings with your basic x-x-x-x xt manually coded. then use those timing with your 980 and see if that helps. My 980 does wonky stuff like that during overclocking with different uclk speeds.
another thing to try... are you running 1.5x memory spd uclk? or 2x memory spd uclk? if your running 2x back it down to 1.5x see if that helps.
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