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CAS , confuses me a lot,,,,

After reading stuff i got more confused!
when i buy ram, do i look for the lowest CL ? an the maximum hZ?

I will give you an example, what to choose

CORSAIR CMZ8GX3M2A1600C9R VENGEANCE 8GB (2X4GB) PC3-12800 DUAL CHANNEL KIT
cl 9 ddr3 selling for 83 euro

or

CORSAIR CMZ8GX3M2X1600C7R VENGEANCE 8GB (2X4GB) PC3-12800 DUAL CHANNEL KIT
exact the same ddr3 but with cl7! selling 20 euros more!

i always thought lower CL = better! is that right?

so what is the best?
is the 20 more euros really worth it?
5 answers Last reply Best Answer
More about cas confuses lot
  1. Just go for 1600 MHz CL9
  2. Best answer
    lower CL=better? Yes.
    What is the best? The one with CL7.
    Worth it? Price wise, no. Performance wise, yes.

    Here's how:
    MHz: Memory speed is measured in Mhz much like processor speed is. Without going into detail, the general rule is that more Mhz = more overall speed.
    CL: An easy way to think of it is this: It's the time it takes for data to get from one of the RAM storage locations on the RAM Stick to the Pins on the bottom of the ram stick, before it gets transferred to the memory controller for processing. Generally speaking, lower is better.
    Therefore, for the number of complete reports in unit time, the formula is:
    MHz/CL.
    Therefore
    For 1600MHz RAM with CL 9, number of complete reports=~177
    With CL 7=~228

    What that means is how fast information is delivered. Same MHz lower CL=better.
    BUT, that's the technical aspect. Here's the reality:
    Your processor and MoBo(most Modern ones are) should be able enough to utilize this benefit. You won't feel any difference between same MHz RAMs. However, if you take a 2400 MHz CL 7 and 1600 MHz CL 7, then you'll feel the difference, that too in CPU intensive tasks mainly, if if we take a suitable processor.
    My verdict,
    For performance: go with CL7
    For value for money: go with CL9.
    ie, buy them on a sale, like for 5 Euros more, but not for 20 Euros more!
  3. As far as the memory and frequency are same. the lower the timings the better performance.. But, paying 20 Euros is not worth for that CL7..
    Look at this thread's solution.. Look at the difference in this image - all 1600 MHz with different CLs gives same performance:
  4. thank you both meteorsraining and agera one for so nice answers!
    I got an i5 4440 so its not that powerfull cpu , and 1600 MHz is the max my mobo can run ... so cl9 for 83 euro it is :D
  5. OutlawzGR said:
    thank you both meteorsraining and agera one for so nice answers!
    I got an i5 4440 so its not that powerfull cpu , and 1600 MHz is the max my mobo can run ... so cl9 for 83 euro it is :D


    Anytime :)
    And that CPU, if not the beast, is a very well balanced processor. A 3.1 GHz Quad with 6MB Cache isn't bad at all! A good CPU for Multitasking and some decent gaming. The RAM would work perfectly fine with that. A good Decision.
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