There are both theese problems:
1) I can't stabilise the ram at 2400MHz and 2) if i set 2400mhz, the board boots at 2200 mhz. I have try to ugrade bios, to set ASUS PSC timings but nothing. I'm stable only with 2200 mhz divider and to bclk 106.7 x 52 = 5650 mhz with ram to 1173 mhz CAS 8-13-13-36 1T.