@ Crossg - see if bumping your qpi data link up might help a bit and if you haven't already, bump your VTT a bit more. it seems you may be loosing bandwidth room at the higher mem tests or something or just need a little more VTT for stability.

assuming you're still running 12gb on that rig as shown in your sig. for me it's taking about 1.418 - 1.425v-ish VTT for stability with 2x uncore and data link around 7.4-ish i think (can't recall off the top of my head, away from home at the moment). as long as you can efficiently take the heat with no higher than about 85*c average temps between all 6 cores you should be fine at that high of VTT. also know 980x chips have crapy sensors from what i've been able to find so the high temps you're seeing on only a couple cores is directly related to these crapy sensors apparently. for mine i've had cores 1 and 5 on my RT-gt touch 98-99 yet PC probe, bios, rog and HWmonitor all show about 82-85*c on cpu temps.