Hi, I bought an Asus Vivobook laptop a few weeks ago with 4 GB DDR4 2400MHz SDRAM Onboard Memory, I bought another ram card yesterday from an online shop with the same amount of 4gb memory but I noticed it has a different speed (aprx. 2666MHz) do I need to worry about installing it since it has different speeds? What are the cons and pros of mixing rams with different speeds?