Let us assume there are 4 slots for RAM in a given motherboard A, B, C and D. Slot A and C form a dual-channel and B and D form another dual channel. (They are of same colour physically.)

Now I have 2 similar RAM sticks of 3000 MHz running in dual channel. I am buying 2 similar RAM sticks of 3200 MHz (only available option for me now)

What would be the best configuration to get most speed in games from these?

p - 2 sticks of 8 GB (3000 MHz)

q - 2 sticks of 16 GB in proper dual channel configuration

r - 2 sticks of 8 GB (3000 MHz) and 2 sticks of 16 GB (3200 MHz) inserted in the 2 dual channel configurations respectively.