Hello, and welcome to the Forum.
I will help.
First off, do you know how to Overclock and what it does?
If you do...great, let's get started.
Second: When it says "1600 MHz OC" on a motherboard, it means that 1600 MHz is not standard. it does not mean you necessarily need 1600 MHz RAM. It means you can OC the RAM you have TO 1600 MHz
We will start there First.