a10 7890k problem with dual channel.

The problem is.

I recently upgraded my pc a8 6600k to a a10 7890k, when i put in dual channel mod the pc crashed only in dual channel, in single mode everything is ok. i don't now, what is the problem?,

my pc is

windows 7 64 bits

motherboard asus a88xm-a

processor a10 7890k

memory ram ddr3 2x4 = 8 gb kingston hyperx fury 1866mhz (black).

bios 30.01 Is the most recent.

In the past when I had my old processor a8 6600k had no problems everything works fine, it is now with my new processor that I have problems activating the dual channel  , if someone can help me I would be very grateful.thanks