I also own Astock Deskmini x600, Kingston 6400MT/s 16GB x2 kit, 8600G, Thermalright AXP90-X47 FULL+Noctua fan. I have noticed that, those voltages from 6000 and 6400 XMP-profiles, will add about 10 celsius more to processor temps compared to 5600-profile.
This is not related to memory stuff...