It helps to know the hardware to help one set DRAM up, which is what you asked for help to do, for the INtel you have it is to go to BIOS, enable XMP and it shoulfd set to 1600 for you, if you had a AMD system there are numerous approaches to setting up DRAM as I explained
Depends if the Motherboard supports 1600MHz RAM, sometimes you need to set overclocking on the motherboard so that the RAM runs at it's full frequency, Another thing to note is that normally when RAM is under clocked you actually get improved timings.
What mobo and CPU - Intel uses XMP, AMD uses AMP, DOCP, EOCP or XMP depending on the mobo, the CPU also needs to support it, i.e. on the AMD side, the 965 3C was their first that reliably could run 1600
It helps to know the hardware to help one set DRAM up, which is what you asked for help to do, for the INtel you have it is to go to BIOS, enable XMP and it shoulfd set to 1600 for you, if you had a AMD system there are numerous approaches to setting up DRAM as I explained