My late 2009 27in iMac that just "died", probably the power supply, it has 16gb of 1066MHz DDR3 SDRAM. I'm looking at replacing it with a mid 2011 27in iMac which has 4GB 1333MHz DDR3 SDRAM. Can I use the 1066MHz DDR3 SDRAM in place of the 1333MHz DDR3 SDRAM? I realize this would probably be a downgrade in overall system speed, but will it work?