RAM CAS Latency question

By acacia666avenue
Sep 14, 2007
  1. im looking at some memory, and was wondering what the timings of 4-4-4-15-1T meant.
  2. raybay

    raybay TS Evangelist Posts: 7,241   +10

    This is fancy talk for engineers and designers.
    RAM manufacturers typically list the recommended timing for their RAM as a series of four integers separated by dashes (e.g 2-2-2-6 or 3-3-3-8 or 4-4-4-12 and so on). While there are many other settings related to RAM, these four integers refer to the following settings, which are typically listed in this order: TCL - Trcd - Trp - Tras
    TCL = CAS Latency Time
    Trcd = DRAM RAS# to CAS# Delay
    Trp = DRAM RAS# Precharge
    Tras = Precharge delay
    The BIOS on a PC may allow the user to make adjustments to RAM Timing in an effort to increase performance or, in some cases, increase stability.
    The reality is, they mean very little for someone who has to ask the question.
    You are fine knowing that a CAS latency of 2.0 is better than 2.5, which is better than 3... etc.
    It makes a difference in the very fastest games or graphical design edits, but most of us do not care.
    You can find a lot more online with a gurgle search of "RAM CAS Latency"
    Then read the postings made in the past 9 months especially.
  3. Jase123

    Jase123 Banned Posts: 1,012

    well cas latency is for the more advanced users and since your asking about it theres no point trying to get know all about it as it is very complicated

    But if you want try get know abit about it then heres a link http://en.wikipedia.org/wiki/CAS_latency
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