Two different capacity ram in a computer

Get whatever speed is cheaper, unless you replace your current memory and your motherboard supports a 133 Mhz system clock. Also make sure it is the same type (Im buttuming SDRAM) The system clock is a square wave signal used to refresh DRAM and reference data signals so the changes in voltages on the data lines. Example:

the high and low lines equal voltage levels

clock signal: --------- data signal: --------

Without a clock signal there is no way for the computer to determine if the long periods of low voltage will equal lots of 0s or a few 0s. Without the clock signal to get the logical ones and 0s the system would have no way to determine what the electrical data signal meant unless you would have to use a bipolar or more complex logic system which would most likely be slower because it would take more changes in the data signal to produce the same data. Also with a bipolar logic system current will flow both ways through the line making it more likely to cause interference and making engineering more complex due to semiconductor biasing.

Hopefully you now have a better understanding of what those frequencies in computer components actually are and how they work.

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