Once the card reaches around 83°C, the clocks level out at around 1705 MHz, which is still 100 MHz higher than the base clock.
^^^^still higher than base clock, and those few mhz make basically no difference in the real world.
Here is one of my GTX 1070 machines as an example:
ETH:
GPU0 26.668 Mh/s - GPU0 t=82C fan=96%
GPU1 26.694 Mh/s - GPU1 t=74C fan=81%
GPU2 26.685 Mh/s - GPU2 t=69C fan=64%
GPU3 26.673 Mh/s - GPU3 t=82C fan=96%
GPU4 26.685 Mh/s - GPU4 t=81C fan=93%
All cards are within 0.03Mh or so......does that really look like a bunch of thermal throttling? I can post hundreds of other miner status lists showing the same thing.