Question: is ddr3 the same as pc3?
Answer: DDR3 stands for Double Data Rate type three but does not imply a specific frequency or bus rate. The PC3-xxxx designates the particular RAM's speed rating and means that the memory certified as able to run at that bus speed. So DDR3 RAM PC3-1333 runs at 1333 MHz while the PC3-1066 runs at 1066 MHz.