The most advisable thing is; if you are going to work in Dual Channel, the ideal is to acquire two RAM of the same manufacturer and with the same characteristics, this is to avoid compatibility problems and that, far from helping you in your tasks, your laptop ends up being a disaster and even suffers severe damage. If you are not sure what you can buy, I advise you to buy a model divided into two blocks, with that type of RAM, you will not have any problem.