How to change ram speed when my bios dosen't have it listed

Thecr04

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Aug 10, 2014
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I have 2x8gb of ddr3 1600 mhz ram but the highest i can get it to is 1400mhz in my bios dram frequency.
My motherboard is the asus h8m1-plus and i think the motherboard has an issue or something. It can support 1600mhz ram however.
Any help would be great!
thanks