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    CAS latency is short for Column Address Strobe latency.

    CAS latency is the time (in clock cycles) required to access a column of memory on a DRAM memory module.

    A CAS3 rated memory module requires 3 clock cycles to address a column of memory, where a CAS2 rated memory module can accomplish the same task in only two clock cycles.

    Three steps are required to address DRAM on a memory module, such as a DIMM:

    1. Memory bank selection
    2. Memory row selection (Row Address Strobe)
    3. Memory column selection (Column Address Strobe)

    CAS latency is sometimes abbreviated as CL.

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