AMD CPU & Supported Memory

AMD Athlon II X4 640

Type of Memory Supported:
Support for unregistered DIMMs up to PC2 8500(DDR2-1066MHz) and PC3 10600 (DDR3-1333MHz)


Does this mean i cant use PC12800 DDR3 RAM 1600MHz or will it just slow it down to 1333 mhz?
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More about supported memory
  1. Basically it will run at 1333 mhz unless you overclock.
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