HELP none of the DDR4 RAM slots fit!

What priority of DDR4 slots is best when mixing different ram sets? slot ddr4 Choose a 4-hour time slot delivery £ Weekend all day delivery Order by 9pm £ Weekend time slot, morning before noon £ Tracking your delivery slot ทดลองเล่นฟรีทุกค่าย Choose a 4-hour time slot delivery £ Weekend all day delivery Order by 9pm £ Weekend time slot, morning before noon £ Tracking your delivery

slot onlen What if i have 4×16 ddr4 and i have 4 slots free and i want to add 2 memory , 2×32 ddr4 Motherboard is Fatal1ty X99 Professional Gaming i7 and CPu , e5