I have been reading the different topics and I don't seem to find the answer to my question... I have a Sony VAOIS PCV RX560... It has two slots for RAM. It came with 256 of RAM and I want to add more. My reason for adding is I want to do some minor video editing and I'm thinking the upgrade will speed up my computer. Am I thinking correctly?...Now my question, what I have read says that the max RAM for my computer is 512MB. Why is it max and what would I have to change to increase the RAM if needed? Also can I use a different brand of memory than what is in it? Any help would be greatly appreciated.