What is the difference between the different memory speed

my motherboard manual says it takes 240-pin DIMM sockets supports unbuffered non-ECC 4gb 667/533 mhz DDR memory. I am trying to replace them with a 2GB PC2-6400 or PC3-10600. tell me what will not work and why. plz
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  1. well pc2 6400 is DDR2 800Mhz and pc3 10600 is DDR3 1333Mhz so it 800/1333Mhz
    and what is your motherboard.motherboards
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