I had 32GB of ram (4x8GB). Had crashes, ran a memtest86, it found errors. I went from 4x8GB of Evo Potenza DDR4 CL 15-15-15-36, 1.2V, 2133Mhz to 2x16GB of Corsair Vengeance LPX same CL, voltage, and frequency. I did check to make sure which slots to use (A1 and B1). Game I mostly play is Rainbow Six Siege and with the graphics quality set to "very high" I would stay at a steady 144fps. Now it is at a constant dip of 120fps and even drops to 100fps. I have gome into BIOS/EUFI and made sure all is well and set with the RAM.
Specs:
asrock fatal1ty x470 gaming k4
GeForce GTX 1070
Ryzen 7 2700x
Corsair Vengance LPX 2x16GB
Specs:
asrock fatal1ty x470 gaming k4
GeForce GTX 1070
Ryzen 7 2700x
Corsair Vengance LPX 2x16GB