update 1: I managed to get the 4th Corsair Vengeance LPX 16GB stick to work in my Ryzen 7 3700x, even at 3000 MHz
update 2: Asus obviously exchanged the blown RTX2070 for a replacement one which is on its way back to me
update 3: the power supply seller on fleabay is bitching at me because I opened a case after he told me that he did not want to spend any more time with it.