You will know you got into your BIOS if see a screen like this. On the top section, for this RAM, it should say the DDR speed is 3200 Mhz. If you do see this, skip to the final step.

If you do not, with your arrow keys go to the OC section, scroll to DRAM frequency and instead of auto, select the rated speed of your RAM. (Don't forget to save this setting.)