DRAM - Can I use PC133 or PC100 SDRAM in my PC that has a 66MHz front side bus?

All SDRAM is backward compatible and can run at any bus speed slower than its rating.
A PC133 SDRAM DIMM is capable of running at 133MHz, 100MHz, and 66MHz.
There are some older motherboards that require 66MHz SDRAM and that will not accept PC100 or PC133 SDRAM, but they are very few.

Please use our Memory Configurator to find compatible modules to upgrade your computer.


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