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Thread: CAS or Mhz ???

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    Question CAS or Mhz ???

    Hey all,

    This has been puzzling me for a while, which is the more important factor to consider when buying ram, the cas or the (bus) Mhz speed at which the stick operates at ?

    For example there are three different sticks of ram you could get.
    One stick running at a cas of 4 but with a 675Mhz bus speed, while at the other end of the scale, there's a stick at cas of 2 but running at 400Mhz bus speed, and for the middle ground the third option is a stick at a cas of 3 with a bus speed of 500mhz.
    Seems as the bus speed goes up so dose the cas level.

    So what would you do ? Stick to a low latency level with a cas of 2 but only running at a bus speed of 400Mhz or would the cas level not make much difference if the bus speed was at 675Mhz ??

    Thx, Dave
    Last edited by Dave_07; 30-08-2005 at 03:16 PM.
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    For my new PC I've gone with my OCZ Platinum stuff, 2-2-2-5 timings. I was too lazy to post here and ask the same question, and it was a bargain going on eBay So, I'd appreciate an answer to this question tooo

    As far as I know, if you intend on overclocking Mhz is key, for out of the box speed low CAS is to go for.

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    Question

    Quote Originally Posted by Tobeman
    For my new PC I've gone with my OCZ Platinum stuff, 2-2-2-5 timings. I was too lazy to post here and ask the same question, and it was a bargain going on eBay So, I'd appreciate an answer to this question tooo

    As far as I know, if you intend on overclocking Mhz is key, for out of the box speed low CAS is to go for.
    May i ask what the bus speed is of that 2-2-2-5 ram you got there ?
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    Itll be 400mhz.

    Ram rated at 675mhz or cas 4 will be DDR2, which is not compatible with DDR

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    Oh yeah sorry i didn't mention that one or two of the sticks were ddr2, but im not too bothered about whether it's ddr 2 or not, ill just get a ddr2 compatible mobo if it ends up that the ddr2 sticks are the best to get, whats important is which is more important, the cas or the bus speed ?
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    If youre buying intel then get things rated at high speed since intel like higher clocks as opposed to low latency. definately get ddr2, cos then youll have one of the newer chipsets with more features. DOnt worry about it too m

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    Remember that AMD does not take DDR2. Make your CPU decision first.
    Quote Originally Posted by Errr...me
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    get both high speed and low latency then you don't have to bother about which gives you more speed . the only problem is that it costs slightly more.
    your computer is similar to a fridge in that if it cannot keep a beer cold then it sucks

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    Question

    Quote Originally Posted by unrealuniverse
    get both high speed and low latency then you don't have to bother about which gives you more speed . the only problem is that it costs slightly more.
    Wish i could but everything i've found seems to conform to this tread of higher bus speeds = higher cas levels. I seem to remember reading somewhere that the cas level was the core, the soul of the ram if you will, and if that was too high, it wouldn't matter how high you pumped up the bus speed, it would always be doomed to be bottlenecked my the high cas levels, is there any truth to this ?

    ps, the cpu would be AMD, so i guess that rules out ddr2 then.
    However there is still plenty of range in cas vs bus speeds in the ddr market.
    So my original question still stands i guess, > cas or bus, which do you prioritize ?
    Last edited by Dave_07; 30-08-2005 at 04:11 PM.
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    Quote Originally Posted by Dave_07
    Wish i could but everything i've found seems to conform to this tread of higher bus speeds = higher cas levels. I seem to remember reading somewhere that the cas level was the core, the soul of the ram if you will, and if that was too high, it wouldn't matter how high you pumped up the bus speed, it would always be doomed to be bottlenecked my the high cas levels, is there any truth to this ?

    ps, the cpu would be AMD, so i guess that rules out ddr2 then.
    However there is still plenty of range in cas vs bus speeds in the ddr market.
    So my original question still stands i guess, > cas or bus, which you prioritize ?
    yep low CAS is the best as high gives you about a 5-15% drop in some cases. i would go for high bus speed about DDR500 or so. when running at stock DDR400 (with the AMD) put the timings as low as possiable without crashing to give best performance and good overclockability if you so need it. If you overclock remember to run the ram at default timings though.
    your computer is similar to a fridge in that if it cannot keep a beer cold then it sucks

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    Can't afford to overclock at the mo, when i get the new systems, they have to last, don't want to do anything to endanger them, so oc'ing would be off limits, for the first year at least anyway.
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    Well if you arent going to touch any settings id go for lowest latencies possible on DDR 400mhz (pc3200) ram. But remember not to pay too much for the lower latency, its probably not worth it.

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    If you are not going to push the Ram freqs up and OC then there is little point getting
    ram which is rated to go at high freqs. Probably if you run the higher rated freq ram at
    a lower normal freq then you will likely be able to have lower tighter timings.

    I personally would go for higher freqs over cas etc. The higher the freq the lower the
    cas ratings affects. If you know what i mean.

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    Quote Originally Posted by Kumagoro
    If you are not going to push the Ram freqs up and OC then there is little point getting
    ram which is rated to go at high freqs. Probably if you run the higher rated freq ram at
    a lower normal freq then you will likely be able to have lower tighter timings.

    I personally would go for higher freqs over cas etc. The higher the freq the lower the
    cas ratings affects. If you know what i mean.
    i think thats what i was trying to get at but yours is more simply put. thanks
    your computer is similar to a fridge in that if it cannot keep a beer cold then it sucks

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    Senior Member Dark Horse's Avatar
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    This is a bit old but should answer all of your questions:

    http://www.techwarelabs.com/reviews/.../index_3.shtml

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    Look at this way, 400Mhz/CAS2 = 200MC/s? 600Mhz/CAS2.5 = 240MC/s, 500Mhz/CAS2.5 = 200MC/s 600Mhz/CAS3 = 200MC/s

    Simply put it like this, 400-CL2, 500-CL2.5 and 600-CL3 all have the same CAS latency (in terms of nanoseconds not cycles). BUT data transfer is not just about CAS latency. CAS latency is just a small part of the data cycle.

    If you ram can't go DDR500, DDR400 CL2 range gives you the most. But DDR500 CL2.5 can't be slower than DDR400 (unless 2T command rate is used), neither do DDR600 CL3. If you look at CL1.5, although at DDR400 it is like 267MC/s, since CAS is not a big part of the data cycle, the performance growth is minimal.
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