Ask yourself: WERE IS THE POWER???
PSU POWER are needed to perform. LOW PSU Watt, what is the cost?
What apple has done with this new Mac (PRO) is make everything and performance “sleep”.
This stupidity small case that can’t even support a express card…
Small case = a lot of heat. Lower the performance, “sleep” = no heat… like the same as a laptop…
I just saying… 
Best Regards
Freddie