They are, as is 3:3, 6:6 and so forth. Thrax opined a couple of months back that 4:4 was faster, based on what testing or reading I am unsure. Mine runs equally in benchmarking at 4:4 or 6:6, which are the only 2 settings I have tried with my 2100+ @ 11X210 / NF7-S 2.0
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The ram ratio represents how fast or slow the memory is in relation to the FSB. 1:1 means a 215 FSB is 215Mz memory. ETC.