Hey Worm
1600MHZ will work on your motherboard regardless. if you arent clocking the dimm slots to 1600 it will lower the clock speeds on the 1600 memory down to 1333. Its probably got the new Intel/AMD overclocking profile built in, in which it just ups the the frequency on the module. If you post your motherboard part number i can do some more research for you and tell you exactly how the overclocking profiling works.