DRAM - Can I mix different DRAM memory speeds?

You can use memory modules of different speeds as long as they are faster than those specified for your computer. It is recommended to use modules of the same speed as those already installed in your system. If you do mix speeds, the modules will all run at the speed of your slowest modules.

For example, for a DDR2 667MHz system you could add 800MHz modules, they will run at the 667 speed.

You cannot mix DDR, DDR2, DDR3 in a system as each technology requires a different type of socket.

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Speeds available from INTEGRAL MEMORY

Technology Type Speed  Bus Speed
DDR3 PC3-10666 1333MHz 667MHz
DDR3 PC3-8500 1600MHz 800MHz
DDR2 PC2-4200 533MHz 266MHz
DDR2 PC2-5400 667MHz 333MHz
DDR2 PC2-6400 800MHz 400MHz
DDR PC2100 266Mhz 133MHz
DDR PC2700 333MHz 166MHz
DDR PC3200 400MHz 200MHz

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