I have found one parameter (NB to DDR Reference voltage) of my Maximus 2 Gene which prevented overclocking of RAM and i remake CL5 and CL4 tests of all modules with this results:
CL4 single channel 580 MHz 2.55V
CL4 double channel 570 MHz 2.55V
CL5 single channel 650 MHz 2.55V
CL5 double channel 640 MHZ 2.55V
640-650 MHZ CL5 limit of this motherboard, i need DFI or Gigabyte P45 boards for more tests. For my opinion this chip they pass 730-750 mhz on air.