Do you mean no difference in terms of performance? Don’t use a very simple scene like that for benchmarking, the base rendering overhead is likely going to be dominant there. If possible, you could do us a favor and test the BMW27 benchmark (and maybe some of the other scenes in the benchmarks suite) with different tile sizes (like I have done here) and post them in the GTX1080/1070 thread.
Having said that, the Titan uses a high-end chip, about as large as it could be. The 1070 uses a mid-range chip that is about half as large as it could be. The 1070 has slightly more transistors and theoretical FLOPS but also lower memory bandwidth than the Titan, so at least on paper it shouldn’t be a surprise if it performed similarly. Many of the gaming-related optimizations aren’t going to kick in for CUDA, either.
It is like if it is offset by some pixels. Why?!?!?
There could be an issue in the way ray origins are calculated due to different block sizes (pure speculation), or maybe it’s somehow different due to the new CUDA SDK being used. Either way, you should report it.