I am in the process of upgrading my RAM for my Intel P4. I currently have a pair of 128MB PC600 (600MHz) Rambus RDRAM 184-pin RIMM Memory (256MB total). 600MHz being the most important part of that last sentence. I have 4 RAM slots total and I was wondering if i was to purchase a pair of 256MB PC800-40ns (800MHz) Non-ECC Rambus RDRAM 184-pin RIMM Memory (to create 768MB total) if that would funciton fine alongside my current 600MHz memory. Or do i need to be consistent and get more 600MHz rdram? I was also wondering if, after purchasing the 2 sticks of 256MB, if the sticks need to be in a certain order. For example: do the 256MB sticks have to go in "first" order and then have the 128MB sticks "second?" ANY HELP or ADVICE is appreciated, thank you!