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Tech Report
As you probably know by now, DDR3 memory enables higher clock speeds (and thus bandwidth) than DDR2-type memory, and it can operate at lower voltages, leading to reduced power consumption, as well....
The new Phenom IIs officially support DDR3 memory at up to 1333MHz, but the multipliers are present for 1600MHz operation, as well, as they are in high-end Core 2 and Core i7 systems.... One caveat: the Phenom II only supports 1333MHz DDR3—at least, officially—with a single DIMM in each memory channel. With four DDR3 DIMMs, 1066MHz is the standard. Such limitations are nothing new, of course. Previous Phenoms have long supported 1066MHz DDR2 memory, but only with a single DIMM per channel.