I know iMac Early 2009 only supports speed up to PC1066...but there is a chance that I might buy iMac 2011 model that supports PC 1333 speed in the future. Now I was wondering if I could just buy the PC 1333 RAM for my current 2009 model and be ok? That way when I purchase the 2011 later, I won't have to buy another RAM.. Does anybody have experience on this? Thanks.