I have an Acer Aspire E 15 E5-575G-78VW laptop, what has a Intel Core i7-7500U 2.7Ghz processor with turbo boost up to 3.5Ghz. I have in it a 8 GB DDR4 ram, and I want to ask if that if I want to upgrade the ram since I have two slots, can I add another one with 16 GB or I need to add another one with 8 GB? My specifications say I can add up to 32 GB. But I was reading some discussions that if I have an 8 GB stick, I shouldn't add another one with different size but I should stick to another 8 GB. But Since I work with big software to illustrate, I would really like to add 16 GB if it's possible.