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Thread: Differences between Cas2, Cas2.5, and Cas3




  1. #1
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    Feb 2003
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    This is to help all those who disagree or don't know the differences between the two. The benchmarks were done on the following.

    Abit IC7-G i875p chipset
    Twin 256mb Corsair XMS3500
    Pentium 4 2.4c

    I ran all these at 275mhz FSB (1100 QDR), with the memory at a 5:4 divider resulting in a 220mhz memory speed. In turn the CPU speed was 3.3GHz

    Cas 2 timings (2-2-2-5) (Most nice PC3200/PC3500 use this)

  2. #2
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    Cas 2.5 (2.5-3-3-7) Low Grade PC3200/PC3500 use this, some PC3700

  3. #3
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    Cas 3 (3-4-4-8) Most PC3700 use this and everything over it does

  4. #4
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    As you can see, there is a fairly decent difference in the scores for different Cas latencies. Although these differences are noticed moreso in actual gaming, the syntethic benchmarking puts it into perspective. In all, when it comes down to it, some nice Cas 2 timed PC3200 or PC3500 is better than Cas 2.5 or Cas 3 PC3700 and up.

  5. #5
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    Just tryin to keep this visible to all the n00bs ;)

  6. #6
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    Ya dude that is very informative! I was always wondering how much the CLs effect the speed.

    I would like to know why the CPU score was better on the 2.5 than the 2?? maybe its just the benchmark program drunken train of thought in windows... hah



    ------
    i just noticed: how the hell did I post to this if its locked???

  7. #7
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    Bagga...that is barely a difference...3 points..probably due to some sort of program running in the background, because when you restart you computer...it does different things everytime..so the score won't stay static but change everytime you run a test..there is to small of a point difference to even care.
    CPU: Opteron 165 @ 311x9 - 2817.8 mhz - 1.47v
    Mobo: Abit KN8-SLI
    RAM: 2x512 Crucial Ballistic Tracers500 @ 202 mhz 2-2-2-5 T1
    GFX: Asus EAX1950pro @ 648/1408
    PSU: Thermaltake 500w
    SC: Audigy 2 zs
    LCD: 22' Samsung 225bw
    Speakers: Klipsch ProMedia 5.1 Ultra
    Mouse: Logitech G5

  8. #8
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    Feb 2004
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    ack. yeah duh... I was totally just spacing out last night..

  9. #9
    Beefy Guest

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    That's nice and all that the number changes... But in the realworld, what's the difference?

  10. #10
    Join Date
    Dec 2002
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    I'm a little confused.

    I have a 256mb stick of Corsair XMS pc3200 CAS 2.0 - Yet, when I OC my T-bred 2,600, the timings go up since they are set to auto. This inturn ups the CAS to 2.5.

    So, originally, they are 7,2,2,2.0 - now they are 8,3,3,2.5 - Which is the better setting? Or should I use expert settings and put the ram timings back to something?

    BTW - Could someone specify the optimal timings for this brand of ram, I'm not real confident in "learning through doing". Thx.
    ~AlthonXP T-Bred 2,600 @ 2305mhz~
    ~Epox 8RDA+~
    ~Hercules Radeon 9800XT 256mb~
    ~512 Corsair P3200 @ 6,2,2,2.0~
    ~WD1200JB HDD~
    ~Antec 1080 Plus~

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