Install the modules into DDR4_1, DDR4_2 for better compatibility.
Cheers mate as I have them currently in 1 and 2.I only found out this week from a very helpful forum member that my memory where in the wrong slots because Gigabytes manual is useless and they say which slots to use in the online memory compatibility list, something that I have never looked at before. Looking at the list for your board, for a pair of sticks to run in dual channel it states at the bottom:-
You really need to get out more may help you to be more helpful and less unpleasant.RTFM
You really need to get out more may help you to be more helpful and less unpleasant.