"Faster" RAM at lower clock speeds?

"Faster" RAM at lower clock speeds? I've been kind of interested in the mechanics (er, electronics) of computer systems lately and after a bunch of research and looking at my computer's properties, I've come across something strange.
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Guest [Entry]

"You can use the performance index described here: www.anandtech***/show/7364/memory-scaling-on-haswell/10
I am not sure how it applies to low speed rams, but in your case:

333/5 = 66.6
266/4 = 66.5
200/3 = 66.7

So in theory it does not matter which settings you choose."