For theoretical FP64 flops, it should be closer to 128GFLOPs. Assuming 10W TDP, that would put it at 12.8GFLOP/Watt, putting it right there at the (Double precision) GFLOP/Watt ratio for pretty much all the top chips for 2015 (coming from Intel, AMD, Nvidia, etc). I guess it is nice that it is an SoC, but I'm not super impressed (then again, I am biased).

Anandtech (http://www.anandtech.com/show/8811/nvidia-tegra-x1-preview) is reporting that it is a Big.little A57/A53 combo...I'm not completely surprised that they went with off the shelf ARM cores instead of Denver, but it makes me think they are putting Denver off to the pasture (especially since they say they are not going to be going after the HPC or Server markets with it). Denver has some interesting code morphing (a la Transmeta) tech, but has in order instruction pipelining. This saves a lot of complexity for the chip, but decreases performance in most usecases (but NVIDIA claims that it is more efficient 80% of the time for the average mobile user). Maybe NVIDIA determined that out of order execution that the ARM reference A57/A53 cores provide is better for the applications they seem to be targeting with the X1 (automotive).