Someone used gtx 980ti with spmod or 2.2.5 version and can share best overclock settings?
On what algo?
x16r and phi
On x16r. I start out with power limit @70%... Core 0... but you could increase it a little ... say 50+. And memory +200 works without crashing. You could get more hashrate ..but at a higher cost of electricity. Experiment ..see what gets you the highest hash per watt.