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Thread: DDR3, does it 'do' 5-5-5-15/18 ?

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    DDR3, does it 'do' 5-5-5-15/18 ?

    The RAM I'm using is in the spec to the left and for the life of me I cant get to run @ 5-5-5-15/18.

    It simply refuses to boot even @ 1066MHz (I've not tried 800) with 1.65v, obviously I don't want to be going any higher than that.
    I've managed to get 1400MHz @ 6-6-6-18/1.60v which I thinks quite good tbh, and according to Everest out-paces an tri-channel i7 965 set up @ 1333MHz.
    It's just bugging me that it wont do 'low' timings that my old DDR2 Dominator RAM was pushing @ 1066

    Anyone got any ideas or actually attained 5-5-5-15/18 w/ DDR3 <=1.65v ?
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    Re: DDR3, does it 'do' 5-5-5-15/18 ?

    DDR3 is usually always 7-7-7-20 or higher. 1600MHz RAM surely won't be able to reach 5-5-5-15.
    on my i7 system (sold it now) i had my 1333MHz RAM @ 1866MHz constantly stable and that was at 7-7-7-20. how about you just try and ramp up the MHz instead of lowering the latency? should come to the same effect?

    good luck.

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    Re: DDR3, does it 'do' 5-5-5-15/18 ?

    Quote Originally Posted by Terbinator View Post
    The RAM I'm using is in the spec to the left and for the life of me I cant get to run @ 5-5-5-15/18.

    It simply refuses to boot even @ 1066MHz (I've not tried 800) with 1.65v, obviously I don't want to be going any higher than that.
    I've managed to get 1400MHz @ 6-6-6-18/1.60v which I thinks quite good tbh, and according to Everest out-paces an tri-channel i7 965 set up @ 1333MHz.
    It's just bugging me that it wont do 'low' timings that my old DDR2 Dominator RAM was pushing @ 1066

    Anyone got any ideas or actually attained 5-5-5-15/18 w/ DDR3 <=1.65v ?
    Why do you want to make your DDR3 go at DDR2 speeds? Nostalgia?

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    Re: DDR3, does it 'do' 5-5-5-15/18 ?

    Quote Originally Posted by Infinite View Post
    Why do you want to make your DDR3 go at DDR2 speeds? Nostalgia?
    That's what I was wondering. It's not as if memory latency is a big issue with current micro-architectures. Unless the OP has *specific* ultra-low-latency application requirements, then slowing down RAM access is only going to serve to hurt performance.
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    Re: DDR3, does it 'do' 5-5-5-15/18 ?

    Umm if you mean this stuff http://www.ocztechnology.com/product...triple_channel
    Then it's 1600mhz 8-8-8-24 1.65v cas8 not cas6

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    Re: DDR3, does it 'do' 5-5-5-15/18 ?

    No I wouldn't expect DDR3 to do 5-5-5-15 because the cycles are shorter than DDR2. In fact Cas7 on DDR3 is comparable to 5-5-5-15 on DDR2.

    Pulled straight from Wikipedia:

    http://en.wikipedia.org/wiki/DDR3_SDRAM

    "While the typical latencies for a JEDEC DDR2 device were 5-5-5-15, the standard latencies for the JEDEC DDR3 devices are 7-7-7-20 for DDR3-1066 and 7-7-7-24 for DDR3-1333.

    DDR3 latencies are numerically higher because the I/O bus clock cycles by which they are measured are shorter; the actual time interval is similar to DDR2 latencies (around 10 ns). There is some improvement because DDR3 generally uses more recent manufacturing processes, but this is not directly caused by the change to DDR3."
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    Re: DDR3, does it 'do' 5-5-5-15/18 ?

    I mentioned in my original post that i just found it really annoying that it wouldn't run @ 5-5-5-15. for final settings I'll probably try and stick to 7-7-7-20 at highest and maybe get to around 1500MHz for my 25/7 performance - who know's

    like I say, I just found it weird it wouldn't run at the timings I mentioned
    Kalniel: "Nice review Tarinder - would it be possible to get a picture of the case when the components are installed (with the side off obviously)?"
    CAT-THE-FIFTH: "The Antec 300 is a case which has an understated and clean appearance which many people like. Not everyone is into e-peen looking computers which look like a cross between the imagination of a hyperactive 10 year old and a Frog."
    TKPeters: "Off to AVForum better Deal - £20+Vat for Free Shipping @ Scan"
    for all intents it seems to be the same card minus some gays name on it and a shielded cover ? with OEM added to it - GoNz0.

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    Re: DDR3, does it 'do' 5-5-5-15/18 ?

    Quote Originally Posted by Terbinator View Post
    maybe get to around 1500MHz for my 25/7 performance
    I've always said there aren't enough hours in the day

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    Re: DDR3, does it 'do' 5-5-5-15/18 ?

    In my life I decide how many hours there is
    Kalniel: "Nice review Tarinder - would it be possible to get a picture of the case when the components are installed (with the side off obviously)?"
    CAT-THE-FIFTH: "The Antec 300 is a case which has an understated and clean appearance which many people like. Not everyone is into e-peen looking computers which look like a cross between the imagination of a hyperactive 10 year old and a Frog."
    TKPeters: "Off to AVForum better Deal - £20+Vat for Free Shipping @ Scan"
    for all intents it seems to be the same card minus some gays name on it and a shielded cover ? with OEM added to it - GoNz0.

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    Re: DDR3, does it 'do' 5-5-5-15/18 ?

    Quote Originally Posted by Terbinator View Post
    I mentioned in my original post that i just found it really annoying that it wouldn't run @ 5-5-5-15. for final settings I'll probably try and stick to 7-7-7-20 at highest and maybe get to around 1500MHz for my 25/7 performance - who know's

    like I say, I just found it weird it wouldn't run at the timings I mentioned
    DDR2 wouldn't run at the latencies of DDR1 either ...
    different thing, different parameters

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    Re: DDR3, does it 'do' 5-5-5-15/18 ?

    Quote Originally Posted by BUFF View Post
    DDR2 wouldn't run at the latencies of DDR1 either ...
    different thing, different parameters
    That's what I was initially getting at/after. Any suggestions for what the best combo would be? I assume I should be after the combination which offers the most bandwidth while staying under 1.65v
    Kalniel: "Nice review Tarinder - would it be possible to get a picture of the case when the components are installed (with the side off obviously)?"
    CAT-THE-FIFTH: "The Antec 300 is a case which has an understated and clean appearance which many people like. Not everyone is into e-peen looking computers which look like a cross between the imagination of a hyperactive 10 year old and a Frog."
    TKPeters: "Off to AVForum better Deal - £20+Vat for Free Shipping @ Scan"
    for all intents it seems to be the same card minus some gays name on it and a shielded cover ? with OEM added to it - GoNz0.

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    Re: DDR3, does it 'do' 5-5-5-15/18 ?

    Pretty sure I read an article a while back (quite a while, think it was about DDR !) suggesting a nominal Mhz figure against a CAS latency or similar.....I believe it was around 4-4-4-xx being similar to 5-5-5-xx at +100MHz, but - unfortunately - cannot prove that out with said article.

    I guess the thing to do is run a small suite of benchmarks with higher clock speed then lower latencies and see what brings best results forwhat you primarily use PC for ?
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    Re: DDR3, does it 'do' 5-5-5-15/18 ?

    The memory controller in the Phenom II tends to be prefer lower latencies though especially with games:
    http://www.tomshardware.com/reviews/...ddr3,2319.html


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    Re: DDR3, does it 'do' 5-5-5-15/18 ?

    Quote Originally Posted by Terbinator View Post
    Any suggestions for what the best combo would be?
    Personally, I'd go back to the default timings and push them to as high a clock as they'll go.

    As a guide, theoretical latency with 6-6-6 @ 1400 is the same as 7-7-7 @ 1633 and 8-8-8 @ 1866 (~4.3ns, I think...), but the bandwidth increases by 17% / 33% as you increase the clock rate. If you want to work out the actual latency for a given CL / Clock combination divide 1000 by the clock speed in MHz then multiply by the CL number - AFAIK real world performance is far more dependant on memory bandwidth that latency, though...
    Last edited by scaryjim; 11-12-2009 at 06:47 PM.

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    Re: DDR3, does it 'do' 5-5-5-15/18 ?

    Quote Originally Posted by Terbinator View Post
    In my life I decide how many hours there is
    you are very lucky

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