UPDATE:
I've received the new Supermicro Z390
Suddenly there is something in the G-Unique that doesn't allow the system to start. Then, I think that also it was the cause for the system instability with the previous motherboard.
With the new one, it seems that the system get power, but after half second everything goes down, and even the 24pin G-unique has anymore the blue light on.
Maybe is some protection that the Supermicro has; I had a similar issue with another G-unique and the ASrock Z390 Phantom ITX. The same config was working perfectly with a GIgabyte and an Asus.
OR, maybe is something with the EU 220AC?
Anyway, come back to the trusted HDplex 160W! And a few new things:
I've painted the green aluminum riser in black
I've changed the fan for x2 SilentWings 2, to check if the noise is better than the NoiseBlocker
Swapped the Quadro with an Asus 1050 TI, WITHOUT FANS - passive!
This stay on the 50 degrees while 3D Modeling! and Pass the FurMark preset with a max temp of 72 degrees - fan BIOS settings as "Quiet".
IF I see it will get to hot I will put its heatsink on the Quadro, and that's it!
Actually now I am curious to get one of the 1650 LP to see how it runs in passive mode!