I have a rig of 6 x 2080. First, remember that there are no miners totally compatible with the new nuclei other than the CUDA, such as the RAY and the Tensor. So in the future it will improve.

It usually equals or exceeds in a bit the 1080ti in almost all the algos.

The good thing is that it is worth less than the 1080ti 2 months ago, and that its maximum TDP is 210W instead of the 250W of the 1080ti, matching performance, which will eventually improve as the mining software does.

I work at 85% of TDP about 180W of consumption. But I have seen reviews that work with TDP of 60-65% and increase more the core about 100-200 and memory between +200 and +1000. It works very well with low TDP.

Cuda 10 is only necessary right now to support RTX