2 or 3 people have confirmed on my blog
I've asked them about the rest of the config. Just tested my GTX Titan X in heavy load mode and 2x6-pin power - no issues at all. This test does not make any load on the CPU's.
CUDA-Z doesn't insta-lock the system and shut it down in Heavy Load mode?
Edit: I just ran CUDA-Z with my GTX 780 while on the 378 Pascal drivers. CUDA-Z is showing the driver version as 10.16.34 (355.10.05.35f05) instead of what the nvidia control panel says is loaded (378.05.05.05f01). So either nVidia's control panel is lying or CUDA-Z needs to be updated to check/see web drivers on OS X. Also, in my case, CUDA-Z does not increase its numbers under heavy load. They remain identical to non-heavy load mode. So it looks like at this point, at least in OS X, CUDA-Z's results are suspect at best.