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Thread: the numbers?

  1. #1
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    Default the numbers?

    what do all the numbers in the memory mean? Like the timings and the Cas Latency?

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    Default

    They are the amount of cycles it takes to do a specific instruction (read/write/copy, etc). All you really need to know is that lower is better. CAS, RAS to CAS, RAS Precharge and TRAS are the important ones, with 2-2-2-5 being the best, though 2GB kits will barely ever achieve this and i'm not even considering DDR2 which i won't give a poop about until socket AM2 gets here. With 2Gb kits 2-3-2-5 is achievable with most (infineon CE) high end kits.

    Grab A64 Tweaker (if you have an A64) and SiSoft Sandra. Everytime you lower a timing check bandwidth in Sandra. To find the best from all the timings in A64 Tweaker can take hours and hours for 0.1% performance increase.

    Don't worry about all the others unless your going for 3D mark/Super PI scores or similar. But the above timings i mentioned are important. Also grab the most handy program ever, CPU-Z, i couldn't live without it. I really need to update the download section with all these appz...
    Last edited by Jameson; 01-05-2006 at 10:10.

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    Default

    Im running 3 3 3 8 @ 200MHz. thats probabley crap right

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    Quote Originally Posted by Ciro
    Im running 3 3 3 8 @ 200MHz. thats probabley crap right
    lol yeah it's not too great. have you tried to get better?

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    yeh i started that other thread about how u do it.
    i think im still a little confused. Is it better to have them all lower or is the tras ment to be higher cause it said in ur cpu-z that u were running 3,3,3,10. Dosent that mean that mine is faster.

    It also said u were runing DDR2 thats prob why its slower. But you Frequency is like 3 times faster than mine anyway.

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    Generally lower is better, but there are optimal settings, too. For example, 1-1-1-1 is something no one aspires to (and is impossible anyway).

    TRAS doesn't always perform best at it's lowest possible stable number. For example, on the older NF2 motherboards, a TRAS of 5 offered optimal performance, so this is what people went for. With s939 it was around 7-9, so people would set it there, too.

    So, lower is better, but frequency (or bandwidth) can make up the performance loss of loose timings.

    For example, consider a system that is identical in every way except for the speed and timings of the memory. 230 2.5-3-2-5 will probably equal the performance of 200MHz 2-2-2-5. If you can reach 250MHz 2-2-2-5 it'll take some serious bandwidth to beat it, probably 300MHz 3-3-2-8, possibly even more.

    Please bear in mind that these are just examples, people from other forums have tested this thoroughly in the past and you can probably find those results if you're interested, my example above is simply a guess based on what i vaguely remember and are probably wrong

    As you said DDR2 may not offer tight timings but it makes up for it in raw bandwidth. If you look at the best DDR has to offer (300MHz 3-2-2-5) against DDR2's best (500MHZ+ 4-3-3-10) you can see why both AMD and intel have transitioned over.

    Having said this, someone will probably want to point out that DDR2 is pointless for A64's, but that is not relevent to this thread, though i may aswell add an answer to this before the question is asked. Generally with A64's tight timings are better as the extra bandwidth is wasted (A64 architecture was never bandwidth limited to begin with). You'll find many overclockers aiming for around 350MHz 3-3-3-8 on AM2 rigs which will offer an advantage over the best S939 has to offer, but not by a great deal. If your aiming for 3D Mark world records, that little extra will make or break your position in the top 20 though
    Last edited by Jameson; 24-06-2006 at 10:23.

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