I have 8 GB of DDR3 1066 mhz ram I already own in an older Thinkpad T400. My 2012 MBP has 4 GB of 1600 mhz ram. So would replacing with the 1066 mhz ram technically work? And if so would performance increase? I can validate myself by bench-marking, but I'm curious as to what everyone's thoughts are. Thanks in advance.