On 7900X or higher you won't set 1.4V ... just can't compare that
... 1.3V is enough for 4.8-5.0GHz+ but on water under full load you may see ~100°C.
The same as I said in most other threads about motherboards, I don't like new Gigabyte and I won't recommend them because of various issues on some of them. If you want to move to extreme OC later then grab high ASRock or ASUS. Both these brands in their higher boards have no issues with higher CPU load and higher memory OC.
I have 7900X on ASRock X299E-ITX with 7 power phases and I have no issues with throttling or anything else. CPU could OC as high as on full ATX Taichi or ASUS TUF2 ... 4.7GHz stable and ~4.9GHz for benchmarks. What more, top OC series like APEX won't give you much more than TUF2 or Taichi. Maybe will have something additional if you decide to move on LN2 but on water cooling or in memory overclocking there is pretty much no difference.
The same as I said in most other threads about motherboards, I don't like new Gigabyte and I won't recommend them because of various issues on some of them. If you want to move to extreme OC later then grab high ASRock or ASUS. Both these brands in their higher boards have no issues with higher CPU load and higher memory OC.
I have 7900X on ASRock X299E-ITX with 7 power phases and I have no issues with throttling or anything else. CPU could OC as high as on full ATX Taichi or ASUS TUF2 ... 4.7GHz stable and ~4.9GHz for benchmarks. What more, top OC series like APEX won't give you much more than TUF2 or Taichi. Maybe will have something additional if you decide to move on LN2 but on water cooling or in memory overclocking there is pretty much no difference.