Ideally, you would install a matched pair of two x 8 GB DDR4-3200. That has the greatest chance of success. You could try to add a second 8 GB stick of the same specifications, buying the same speed and timings even if not the same brand. It may work. But, sometimes mismatched RAM brands/models may not play well together, which is why a matched pair is recommended. Try to buy from a vendor that will allow you to return the RAM if it doesn't work. Follow the disassembly and reassembly steps in Dell's Service Manual. Whenever touching components or working inside a computer, wear a grounded wrist strap, also called anti-static wrist strap, ESD wrist strap, or ground bracelet. It's a cheap and sensible precaution. Rest the laptop on an anti-static mat or at least a reasonable alternative such as corrugated cardboard.
Hello, I purchased a Dell Optiplex Micro 5000 computer which came with a SK Hynix SODIMM 8GB (HMAA1GS6CJR6N) memory module. I am looking to add another 8GB of RAM, but the same memory module is difficult to obtain in my location. I have found a potential Hynix module (HMA81GS6DJR8N), but there are some differences between the two modules. The Dell module has x16 organization (all chips on one side) and uses a "c-die", while the potential module has an x8 organization (chips on both sides) and presumably uses a "d-die". I am aware that Crucial memory modules are recommended for the MFF 5000; they also have chips on both sides. However, I have a few questions: Thanks for any advice or input.  
Dell Optiplex Micro 5000 & Memory upgrade