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First, we recommend reading any notes on our website pertaining to your computer or motherboard. Sometimes there are specific rules regarding mixing memory speeds.

In general however, you should choose the fastest speed available for your system. This is because memory in the same series (such as SDRAM, DDR, DDR2, DDR3) is designed to be downward compatible.

This means that:

• PC133 memory will slow down to match PC100 or PC66 as needed
• PC3200 will slow down to match PC2700 or PC2100 as needed
• PC2-5300 will slow down to match PC2-4200 or PC2-3700 as needed

However, PC100 will not run at a higher speed PC133, and the same applies to DDR, DDR2 and DDR3 memory. To ensure the best performance, we recommend that you select the highest speed listed for the system. Ask us if you are not certain.

*Please note* An exception to this rule relates to RDRAM or RAMBUS speeds. These cannot be mixed and you should always match modules with the same speed together.

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