Gigabyte GA-970A-DS3 RAM Help

Stefag40

Honorable
Aug 27, 2013
36
0
10,530
Hello
I bought this mobo yesterday with RAM (4GB DDR3 1600Mhz) but there is problem
When i go in to bios Dram Frequency Shows only 1066Mhz not 1600Mhz...
Here is Picture of CPU-z
HOKIC7N.png

What should i do to make it 1600Mhz?

System specs
CPU AMD Athlon II x2 240 2.80Ghz
RAM 4 GB DDR3 1600Mhz
GPU GTX 650 OC 1GB
MOBO Gigabyte GA-970A-DS3 Rev 3.0