sticks

Hi, I need a little help choosing the ram I need to upgrade my PC. I currently have 16GB (2x8GB) in two slots in my Gigabyte H610M S2H DDR4 motherboard. I'm aware it's able to house 64GB (2x32GB) but I'm only looking to upgrade to 32GB. I have had a look on Overclockers store but I don't know...