How to overclock your memory?
1. Insert both of your memory in DIMMA2 and DIMMB2 (If you motherboard has 4 slots)
2. Power on and enter BIOS setup.
3. Make sure the BIOS version of your motherboard is up to date. (For example X370GT7)
4. Set the Memroy Clock Mode to XMP and press F10 to save & exit.
After system reboot, you will see system is running 3200(OC).