GA-P55M-UD2 Support for DDR3 Meomory Modules

Hey guys, I have just built a new i5 720 system, with GA-P55M-UD2 motherboard and XMS3 DDR3 PC3-12800 1600Mhz 8-8-8-24. Easy build, very straight forward. System is running fine, BUT.. I opened CPU-Z to check out the timing of my RAM, and its running at 9-9-9-24, PC3 Max Bandwidth is 10700H (667MHz). I just checked the motherboard book, and supported speeds are 2200/1333/1066/800MHz. So, my 1600MHz are not listed. Does this mean I can never get the full potential out of my RAM? As I have only just purchased the items, I was thinking of sending something back? Or can I upgrade the firmware or something? Or any settings that can be altered? I honestly thought this motherboard supported 1600MHz RAM. If anyone can help me out I would be very grateful. Im a bit lost when it comes down to the nitty-gritty with RAM clocks and stuff. Do I change the RAM, do I change the Motherboard.. etc