rr metapod_rr

Hi everyone, I have a laptop with two RAM slots. One of the slots is currently occupied by a 4GB DDR4-2400 SK Hynix stick. I recently bought a 16GB DDR4-2400 SK Hynix RAM to upgrade. My question is: should I place the 16GB stick in Slot 1 or Slot 2 when paired with the 4GB for the best...