Just curious that my EVGA z97 classy can run my 2x4G mems at 4.8 G (4790k) in 2 option: 1- 2200Mhz @ 10-12-12-31/1N
2- 2400Mhz @ 11-13-13-31/2N
But sometime I see at command rate 2N under 3Dmark Xtreme test it gives higher scores than at 1N , normally I saw many people offer at low command rate as 1N instead of 2N. Any suggestions !
Thanks!

Note: test bench with 3 gtx 980SC Tri SLI ( stock clock- score ~ 15000).