Somebody over at OCUK forums did this as a bit of maths yesterday.
TITAN V: GPU Cores 5120
1455 MHz (Turbo)= 14.9 TFLOP
1900MHz (overclock) = 19.5 TFLOP
RTX 2080 Ti : GPU Cores 4352
1545 MHz (Turbo)= 13.4 TFLOP
2000MHz (overclock ?) = 17.4 TFLOP
GTX1080 Ti : GPU Cores 3584
1582 MHz (Turbo) = 11.3 TFLOP
2000MHz (overclock) = 14.3 TFLOP
RTX 2080 : GPU Cores 2994
1710 MHz (Turbo)= 10.2 TFLOP
2000MHz (overclock ?) = 12 TFLOP
GTX1080 : GPU Cores 2560
1733 MHz (Turbo) = 8.9 TFLOP
2000MHz (overclock) = 10.2 TFLOP
Which may be why Nvidia are hiding the actual performance. They've obviously misreported the "Up to 6x faster" bit completely, as that means in RT which obviously the 10 series are going to be potatoes at because they don't have RT hardware on them.
We'll see I guess.