Typically, faster SDRAM is designed to run at any bus speed
slower than it is rated to run. This is called backward compatibility.
So in general, a PC133 SDRAM DIMM can run at 133MHz,
100MHz, or 66MHz. However, some
systems may not accept different module speeds, or may require a BIOS upgrade to
fix it. We
suggest that you use same speed modules to prevent compatibility issues.
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