Hello, Well, basically, it's what the title says. I used to have a Mid-2010 MacBook Pro that used DDR3 1067MHz RAM. I bought a new Late 2011 model (the high end 15" with CTO Antiglare, 128GB SSD, and 2.5GHz Processor) and put the old ram from my machine in, as it was 8GB instead of 4, and I didn't feel it was necessary to buy new ram considering I already had some I wasn't using. I'm not asking if this works, as it does (see screenshot) however I would like to know if this would have a negative impact on my computer's performance... basically, does it impact any other aspect than just not being able to run 266MHz faster? Thanks!