Bios Mods -The Best BIOS Update and Modification Source

Config: i7 2600 (non K), Asrock B75M GL, Dual DDR3 1600.
My problem is that this motherbond only shows me 1333Mhz maximum for memory, there is no 1600 or higher. I've made a dump of bios, please look at it, maybe there is a chance to activate higher memory frequencies.
I've already used Amibcp and set requiered fields to "USER", but it doesn't work. I've set up memory freq to 1600mhz in Amibcp, but memory still works on 1333Mhz

The reason is memory controller in your CPU: i7-2600 doesn't support 1600 Mhz.
You need Z-chipset to overclock over 1333 Mhz.

If memory controller doesn't support 1600Mhz, how Z-chipset could overclock it to 2133Mhz?

Read Intel's datasheet.