Here are some benchmarks I did at 2560x1440. I previously had a Fury X in here.
The OC was 2050MHz core and 5544MHz memory.
GTAV
Fury
In Car: 90.1 to 91.7
Driving: Low 80s
1080ti stock
In Car: 152.9 to 157
Driving: Low 140s
1080ti OC
In Car: 168.7 to 173.6
Driving: low 146.3
Note: I was driving around the prison, not the middle of downtown.
TWWarhammer
Fury: 51.6 avg
1080ti stock: 101.2 avg
1080ti OC: 106.7
It really doesn't seem to care about the OC.
Overwatch Test Range Spawn
Fury: 61.8 to 63 Might not be accurate, I think I maybe had the frames limited by mistake.
1080ti stock: 156.8 to 158
1080ti OC: 183 to 187