What is the rate compatiblility difference between 10G products with CDR and without CDR?

In general,10G products with CDR can only support fixed rate or frequency multiplication rate, for example a 10G unit with CDR compatible rate ranges from 9.95~11.3Gb/s, make a 8.5G CDR, it's compatible with the rate of 2.125G/4.25G/8.5G; 10G products without CDR, compatible rate range can be covered with 1~11.3Gb/. From the point of rate, the compatibility for non-CDR functionality product is better.