Your MOBO supports Dual Channel Memory Architecture to a toal of 16GB - In order to enable dual channel technology you need to have Two or four identical memory modules, compatible with the technology supported by the motherboard (DDR-SDRAM, DDR2-SDRAM or DDR3-SDRAM).
On motherboards with four memory sockets, which is the most common scenario, the correct way to enable dual channel technology varies.
If you have four memory modules simply install all of them and dual channel method will be enabled.
If you have two memory modules – which is the most common situation – you have to pay attention.
Usually dual channel is enabled by skipping one memory socket. So you have to install your first memory module on socket 1 and the second memory module on socket 3, skipping (leaving empty) socket 2. Installing the first memory module on socket 2 and the second memory module on socket 4 will also work.
To make dual channel installation an easier process most of the manufacturers use the same color for sockets 1 and 3 and a different color on sockets 2 and 4
The rest of the information with pictures is here for you to see - click here