Difference between CPU Integrated Memory Controller Speed and Motherboard RAM

Hello,

While looking at processors, I noticed that the Phenom II X6 supports:

Dual Channel PC3-10667U (DDR3-1333) for 2 Module, Dual Channel PC3-8500U (DDR3-1066), Dual Channel PC2-8500U (DDR2-1066)

The motherboard says it's DDR3 2133 OC.

Which RAM speed should I buy if I won't be overclocking? Does it fall back to the slower memory controller on the CPU or does it still make more sense to buy the RAM that's rated for the motherboard?
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More about difference integrated memory controller speed motherboard
  1. That is the MAXIMUM speed of memory your motherboard will support, but it really has no bearing on what type of memory you should you buy. It just means that it can support memory up to that speed. But if your processor does not need memory that fast, it is kind of a waste to spend money on it, right?
    For your processor, DDR3-1333 with good tight timings is what you need. You can buy DDR3-1600 to give you some overclock headroom if you plan to overclock the processor.
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