Hi there. With the refresh of the iMacs, we saw ram speeds increase to 1333MHz from 1066MHz. I have some 1066MHz ram (2x 1gb), and if I put it in to the latest gen 1333Mhz machine, it would down clock the rest of the ram to 1066Mhz. My question is, it it better to have 6GB of DDR3 1066MHz OR 4GB of DDR3 1333MHz?? My main uses would be for web surfing, some gaming in Windows (64bit), Word processing and the occasional Photoshop. TIA.