Memory cas latency

memory cas latency is it better to have for say a 7-7-7-20 or like a 5-5-5-15?
i guess my question is when buying memory do yo u want lower cas lat numbers or higher?
it would be for gaming.
also what is faster sddr or ddr?
thanks
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More about memory latency
  1. Cas latency is the first value in RAM timings. In general lower latencey values are better, however ram speed is a factor as well.

    sddr? do you mean SDRAM? If so that is very old and not used anymore.

    For a details explanation of ram timings have a read of this:

    http://www.hardwaresecrets.com/article/26
  2. my mistake on the sdram. sorry.
    thank you
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