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Home>Knowledge Base>What is PC100, PC133, PC1600, PC2100, PC2700, and PC3200 memory?
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Article ID17
Created On6/4/2009
Modified6/4/2009
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What is PC100, PC133, PC1600, PC2100, PC2700, and PC3200 memory?
PC100 and PC133 are types of SDRAM.
PC1600, PC2100, PC2700 and PC3200 are types of DDR.

They are all DIMM's in physical construction. The type of memory, SDRAM or DDR, that can be used in a computer is a characteristic of the motherboard. Most motherboards support either SDRAM or DDR, but not both. However, there are some motherboards that allow either, but not both at the same time. SDRAM and DDR use different types of memory slots for installation. The numbers identify the FSB speed of the RAM.

For SDRAM
PC100 memory runs at a FSB speed of 100MHz
PC133 memory runs at a FSB speed of 133MHz

For DDR,
PC1600 memory runs at a FSB speed of 200MHz
PC2100 memory runs at a FSB speed of 266MHz
PC2700 memory runs at a FSB speed of 333MHz
PC3200 memory runs at a FSB speed of 400MHz