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    Cas Latency

    Discussion in 'Dell' started by Rowshambo, Mar 22, 2008.

  1. Rowshambo

    Rowshambo Notebook Enthusiast

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    Hi guys and girls. I just bought a 4gb dual channel kit for my 1330. I saw that some kits had cas latency of 4 and five. I did some research and found that the lower latency the better. Is this true and how big is the difference between the two? Thanks!
     
    Rowshambo, Mar 22, 2008
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  2. Lithus

    Lithus NBR Janitor

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    Lower (cas) latencies are better, but usually are also lower clocked. For example, 667 RAM usually has a CAS 5, while 533 has CAS 4.
     
    Lithus, Mar 22, 2008
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  3. scythie

    scythie I died for your sins.

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    Yup... And DDR2-667 with CAS 4 is quite rare.
     
    scythie, Mar 22, 2008
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  4. Rowshambo

    Rowshambo Notebook Enthusiast

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    Wow! I guess I got a good deal then. I got a DDR2-667 4gb dual channel kit with cas 4 latency for $79.99 at Newegg.
     
    Rowshambo, Mar 22, 2008
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  5. ValkyrieLenneth

    ValkyrieLenneth Notebook Evangelist

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    It's a good idea to buy high speed DDR2 and install to a lower platform. For example, i put a pair of DDR2-667 (5-5-5-15) to my dad's old vaio which can only run DDR2 @ 533 and i got 4-4-4-10 latency. It's faster than normal DDR2-533 with standard 5-5-5-15.. !
     
    ValkyrieLenneth, Mar 23, 2008
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  6. SteveJonesy

    SteveJonesy Notebook Evangelist

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    CAS latency is the number of clock cycles that have to pass before the CPU and RAM can start exchanging data - it's a one time delay,once the data is moving its moving. The way to think of it is like turning on a tap - CAS is the time it takes to turn on the tap. Once the tap is running it is no longer of any importance.
     
    SteveJonesy, Mar 23, 2008
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