Hello, new to Tom's Hardware, seems like a great place to find knowledgeable answers. So, I recently bought a new laptop (HP m6-1035dx) and want to upgrade the RAM. I have a 4GB module from an old laptop (also HP) that I would like to use to replace the 2GB module in the new one. Here is my question... the new laptop has 2 RAM sticks (one Hynix 4GB 2Rx8 PC3-12800S-11-11-F3 and one Samsung 2GB 1Rx8 PC3-12800S-11-10-ZZZ (the one I want to replace)). The stick that I have lying around is a Hynix 4GB 2Rx8 PC3-8500S-7-10-F2. Am I better off with the original 6GB because the speeds are the same or would it be better to have 8GB even though the speeds would be different? Thank you.