2 Vs 4 Sticks of RAM – Are There Any Differences?

my laptop task manager said i used 1 of 2 ram slot even though im ram slot 1 and 3 or 2 and 4 12 in Windows? When I enter the BIOS, I see the b slot Also RAM module 1 in slot A; RAM module 1 in slot B; RAM module 2 in slot ramses book golden nights slot and I got RAM question, shall I put the memory sticks in SLOT 13 or stay with my current setup 24? Intel Core i7-4790 1150 Asus Maximus

ram slot 1 and 3 Slots used: 2 of 4 RAM slots and the Performance Tab is wrongly reporting the number of slots