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Yeah so your card is already boosting quite high.HWinfo shows a maximum of 1379.5 on the GPU Clock while Heaven was running.
I'd be inclined to get a second 980ti.
Andi.
Most need more than 1.193, especially if you want to lock the frequency at 1500 Mhz. 1.23V is what I would recommend for 1500Mhz and 1.19 for 1450 (better to have a buffer just to make sure you don't experience any crashes). Also remember to raise the TDP and Power usage (you can do this by editing the BIOS).My 980ti needs 1.193 volts for 1500 under water. Slide the power slider across and try again. Maybe try a more aggressive fan curve as well. If I add volts to 1.23 I can get to 1550 plus