If I am not mistaken, that cpu has an integrated memory controller with a stock frequency of 1066MHz. Running at 1600MHz may be stock for the RAM but is a good overclock of the memory controller. I had the same thought process as you and spent 200 bucks on a patriot viper extreme ddr3 2000MHz memory kit only to find that anything higher than 1900MHz was unstable in my rig. After complaining to Patriot, they told me that the speed of the RAM is dependant on the capability to overclock the memory controller. They also said they had numerous customers who reported not being able to go any higher than 1800MHz. They said I could RMA the RAM but would still have the same problem and suggested getting a new cpu. Anyway, do some research and see what kind of numbers others who have the same cpu are able to hit before you purchase new RAM.