@mrk I watched a video about a roundup of motherboards for the Z690 and, I suppose, it was accurate. But if you are aware of some boards simply overvolting by default then it is easy enough to change and this graph......
does make some look worse than others, when that isn't necessarily the case.. I understand other factors can be involved. But by default my Gigabyte board was putting through around 1.4v or so when Cinebench was first ran, albeit LLC on medium and overclocked settings.
If you do not wish to overclock that's fine but by default, IIRC, the CPU / board will boost to a safe limit but, imo, the board itself tends to overvolt for that, well at least mine does.
EDIT: I *think* that you have the Gaming X - well I went for the Aorus Elite DDR4 board....
Z690 AORUS ELITE DDR4 (rev. 1.0) Key Features | Motherboard - GIGABYTE Global
very similar settings, if not the same.