OK I'm starting to like this motherboard more Or it might be the 1204 BIOS.
The LN2 mode just disappeared after the first reset. I mean power off the psu and power on again and there is no LN2 mode anymore
More to this: when I reached 49 multiplayer, my keyboards (connected to two USB 2.0 on the back) backlight started flashing (1 time per 5 sec). I connected the keyboard via USB 3.0- no flashing. Back to USB 2.0- flashing again. This effect took place only when logged to Windows.
After I reset BIOS to default- flashing gone

Someone has similar impressions? Mayby using the 1204 BIOS too?