Help with ram

[d3vil_wow]

Hi guys. I have a asus h81m plus mobo with a intel i5 processor and 2 sticks of ram corsair vengeance low profile 8 gb each . So i put both sticks inside and the bios and the windows read just 8 gb 4 in a slot 4 in the second slot . The ram is dual chanel and have the frequency 1600 but in bios i see just 1333 . On mobo specification say its suppose to support 16 gb ddr3 1600 frequency. So please help me what i have to do . Thanks

 

[Dark Lord of Tech]

What set of memory is this?