As I said earlier....it just reinforces what a lot of us already knew. The cooler you keep them, the higher they'll clock.
Pretty easy to figure out. Maxwell was the same way. Keep a 980ti cooler than 30c peak, your chances of reaching 1600 increase exponentially.
CPU: Ryzen 5 1600X @ 4.080ghz MB: ASUS Crosshair VI Mem: 32GB GSkill TridentZ 3200
GPU: 1080 FTW PSU: EVGA SuperNova 1000P2 SSD: 512GB Samsung 950 Pro
HD: 2 x 1TB WD Black in RAID 0 Cooling: Custom cooling loop on CPU and GPU OS: Dual Boot 7 and 10