I don't think CL4 on DDR3 is real. In 2011 there was a memory competition at HWBot and some guys were entering the CL4 stage with DDR3, so I checked some datasheets and it looks like CL4 isn't supported by DDR3 ICs. ( This was my post back then. )
you're right, it sets back to CAS7 lol but still fun to see :P
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