The read / write performance is far more than the memory interface my camera creates (Canon EOS 7D), nevertheless is the SanDisk Extreme far more favorable than the older SanDisk Extreme IV (the only 45MB / s creates)
Mid-2009, SanDisk has changed the product names and the CF card, there are only the "Extreme" with 60MB / s and the "Extreme Pro" with 90MB / s.