O recently bought those kits. Kelvv Bolt XR non RGB 4000MT/s 19-25-25-25 Hynix DJR. Not the best in term of low timings, but it improvement from 3200Cl 16, or it would be..
I have 5600X on A520M-itx/AC AsRock, and for not OCing CPU this mobo is quite good. I can't OC my 5600X anyway, because...