1600 is technically an overclock. The memory controller (it's part of your CPU) is only rated to 1333. This is true of all CPUs available currently.
1333 would be "normal" even though your RAM is rated to run faster. You will have no problem running it at 1333 as long as your motherboard supports this speed. Most BIOS will default to this speed.
It's very likely that you will be able to go into BIOS and change a single setting to get your RAM running at 1600. This not guaranteed, however.