JEDEC #4 or XMP-2666 which is better

[tryest]

i have G. Skill F3-2666C12-8GTXD PC-10700 (667 MHz) running a I7 4770K clocking at 4.1GHz. Bus Speed 100.16 MHz on ASUS Z87-Deluxe/Quad Motherboard. I have the memory running at 1201.9MHz, FSBRAM 1.9, CAS 12, RAS to CAS 12, RAS 13, Cycle Time 35, Row Refresh 313 clock, CR 2T. what would be the best setting for this memory
Thanks

 

[Tradesman1]

Could try tightening the CL to 11 and initially go 11-12-13-35, might have to raise the CPUVTT (MC (memory controller) voltage a tad