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Thread: Setting RAM timings manually - "Misc timing control" section (GA-P55A-UD3R)




  1. #1
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    Default Setting RAM timings manually - "Misc timing control" section (GA-P55A-UD3R)

    Hi all,

    I've got a Gigabyte P55A-UD3R with a Corsair DDR3-1333C9 8GB kit (2x4GB modules) which by default runs at DDR3-1066MHz. The voltages printed on the modules are 1.50V, DDR3-1333 9-9-9-24. It has an XMP profile which sets these settings, but it also increases the vDIMM to 1.60V and the QPI/Vtt to 1.20V (from 1.10V).

    The first thing I did when I installed the memory was to bump the memory multiplier to 10 to make the ram run at DDR3-1333, stock voltage 1.50V (BIOS health section reports around 1.55V). The timings section was left SPD auto, which ran 9-9-9-25 (so close to the label, but not exact). This tested stable with prime95, LinX, and Memtest and got me thinking that perhaps the XMP profile increases the voltages unnecessarily.

    So for a little test, I want to set the speed and timings according to the XMP profile, but without the voltage increases. I know the timings don't matter a hell of a lot, but I figure if it's been tested to run at these specs, I might as well manually set them. I did so by first turning on the XMP and then changing the SPD timings from Auto to Expert, then I went into each channel settings and copied the reported XMP timings into the right-hand column (changing it from Auto) for both channels A and B:


    Code:
    >>>>> Channel A Standard Timing control: 
    Cas Latency Time........................  9  [9]
    tRCD....................................  9  [9]
    tRP.....................................  9  [9]
    tRAS....................................  24 [24]
    >>>>> Channel A   Advanced Timing Control
    tRC..................................... 34 [34]
    tRRD.................................... 5  [5]
    tWTR.................................... 5  [5]
    tWR..................................... 10 [10]
    tWTP.................................... 21 [21]
    tWL..................................... 7  [7]
    tRFC.................................... 64 [64]
    tRTP.................................... 5  [5]
    tFAW.................................... 25 [25]
    Command Rate (CMD)...................... 1  [1]
    
    >>>>>   Channel A Misc Timing Control
    B2B CAS Delay........................... -  [Auto]
    Round Trip Latency...................... 51 [Auto] (53 reported on Channel B)


    Then I turned off XMP profile, changed the multiplier back up to 10.0, saved changes and did 1 pass memtest and a 30 mins of LinX (just to test initially).

    So for the "Misc Timing Control" section, where B2B CAS delay is blank (-) and Round Trip latency seems to vary on the channel, is it best to leave these on Auto?


    It doesn't seem to matter if it's running at SPD DDR3-1066, multiplier changed to DDR3-1333 or if XMP is enabled, the B2B CAS delay remains blank (-) all the time, and round trip latency doesn't seem to change (although the value seems different on each channel).


    Cheers all!
    Last edited by ozeh; 11-02-2010 at 07:09 PM.

  2. #2
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    Default Re: Setting RAM timings manually - "Misc timing control" section (GA-P55A-UD3R)

    could be just a bios issue,esp if it remains blank at stock speeds
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    Default Re: Setting RAM timings manually - "Misc timing control" section (GA-P55A-UD3R)

    Could you provide an exact link to your RAM? I've looked on Corsair's site but can only see 8GB kits that are i5 certified containing 4x2GB, not 2x4GB.

    I would double check the voltage requirement printed on the side of the sticks too. Also check the SPD using CPU-Z. You should be able to then read timings in the XMP column. There should be an entry for voltage there.

    There's no need to touch Back to Back CAS delay, auto is fine as it will probably set 0. Round Trip Latency values are complicated and are derived from. Uncore, CAS latency and the auto detected skew between DRAM and the Uncore and IMC are factors. VTT can also alter auto detected RTL as it will change any detected skew values. You can try and tighten it for each channel, but beware of the stability implications. They should also NEVER be the same on each channel. Usual stable configurations will have a 2-3 click difference between each channel, ie if A = 50 then B may = 51-53 etc. Play with either at your own risk. Performance gains will likely be non existant in most cases and RTL is more useful for gaining stability at high RAM clocks/overclocks by loosening the value rather than tightening it.
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    Default Re: Setting RAM timings manually - "Misc timing control" section (GA-P55A-UD3R)

    Found a few links to your RAM. Corsair's site has little info other than timings but two third party sites both list your RAM as rated at 1333 9-9-9-24 at 1.6V not 1.5v.

    Corsair CMX8GX3M2A1333C9 , XMS 3 , with heatsink , 2 x 4Gb/4096mb kit, DDR3-1333

    Corsair XMS3 8GB Kit DDR3 PC3-10666 CL9 (CMX8GX3M2A1333C9) 2 x 4 GB (4096 MB) Prices | Review Cheap Deals, Buy and Compare the Cheapest Online
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  5. #5
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    Default Re: Setting RAM timings manually - "Misc timing control" section (GA-P55A-UD3R)

    I thought that might be the case, wazza, though I think that's cleared up below.

    The exact part is CMX8GX3M2A1333C9. It wasn't on Corsair's site a week or so ago (but the model has been out for a while) and it looks like they've finally listed it with along with two other higher speed kits:

    CMX8GX3M2A1600C9
    CMX8GX3M2A2000C9

    listed under XMS or i7 memory solutions - if you click resources then search for the above parts.

    The sticks definitely say 1333MHz 9-9-9-24 1.50V on the labels. CPU-z table shows the XMP profile (which is basically 1333MHz since it's the model name) but with a voltage of 1.60V - as per what i saw in the BIOS earlier. So it sort of appears that XMP profile is overkill for mine, if the test voltage on the label is anything to go by.

    Awesome, that's the information I was after, Psycho101. I just got arrived home did some searching for "B2B CAS" around the place and found many instances where the value is blank or zero, so you're right that appears all normal. I'm not worried about tightening RTL on each channel, rather that "auto" was fine. Indeed you are correct, there's difference between each channel.

    Righto - after this finishes testing (and i'll give it a bash of prime95/linx afterwards) I'll be happy as a pig in mud.


    edit - Psycho, here's Newegg's listing (I love this site as they take things out of packaging and take high-quality photos) http://www.newegg.com/Product/Produc...82E16820145315 - you can click and see one of the sticks's label here.
    Last edited by ozeh; 11-02-2010 at 11:47 PM.

  6. #6
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    Default Re: Setting RAM timings manually - "Misc timing control" section (GA-P55A-UD3R)

    I still wouldn't trust either the label or the XMP profile myself. Usually an XMP profile is set specifically for that model of kit. It may well be that either the label is wrong or the SPD is wrong. For instance they could have changed the version number and the new RAM IC's/PCB used may need 1.6V. On the other hand there could have been a mistake made on programing the SPD.

    On the CPU-Z SPD screen, does the ID's model number match the actual model of the sticks? Sometimes it does not, other times it may have two model numbers. This is because at times they use the best example of model X, tighten timings and/or increase speeds and sell it as model Y maybe with slightly higher voltage needs.

    There are a couple of posts on the Corsair forum about voltage and this RAM kit too. The official respones is "Label voltage is always correct" but who knows... did the guy actually check the issue out?

    Any-hoo, if they work at 1.5V as per the XMP profile's timings then that's a bonus.

    If you happen to need to play around with RAM multipliers, VTT, overclocking the CPU etc then it can sometimes be useful to know of certain "known stable" RTL values. Sometimes auto can get things wrong. This is the only time I'd set them manually.
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  7. #7
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    Default Re: Setting RAM timings manually - "Misc timing control" section (GA-P55A-UD3R)

    Yup, the model number reported in CPU-z SPD tab matches the actual RAM.

    I would have thought the label to be trustworthy? But yeah, I'm taking it as a little bonus in either my CPU or RAM if it doesn't need those bump in voltages. Then again, if we trust the label, then the results here are nothing really extraordinary I think, as it was tested by Corsair at this speed/voltage/timings.

    One last question... personally, how long do you memtest for? Do you consider a 12 hour bash of prime95/linx long enough too?

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    Default Re: Setting RAM timings manually - "Misc timing control" section (GA-P55A-UD3R)

    It seems a bit "chicken and the egg" to me, that's all. If the Label's right then why is the SPD wrong, but if the SPD's right why is the label wrong. The other reason I'm scheptical is because nowhere on Corsair's details page do they state RAM voltage requirements for the kit. Newegg list it as 1.5-1.6V too, so maybe there is a voltage range (not uncommon) and the label has the lower end limit. I can see the kit needing more voltage on some boards with it being two sticks of 4GB, because that's rather dense for a single module. You can get 8GB modules but still 4GB is relatively unusual.

    I usually only run memtest when I first get a RAM kit. I've found that it's great for testing the hardware for faults, but stability wise you can test perfect with memtest and then still have a RAM failure in Windows.

    Generally Prime is best used for a bare minimum (IMO)of ~8 hours, generally 12 hours +. I do 12 hours Large FFT and 24 hours Blend, but that's just me and probably overklill for most people. Linx I would limit to an absolute max of 50 runs. Along with 12 hours of Prime Blend, 25 runs of LinX should be fine for most systems. If gaming also run some 3D tests, such as Heaven, Vantage, and a few Game benchmarks.
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  9. #9
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    Default Re: Setting RAM timings manually - "Misc timing control" section (GA-P55A-UD3R)

    B2B (Back 2 Back CAS Delay) is kinda like tRD (Static tRead Value) in P34/P45 motherboards, it's a performance setting and or can be used at higher ram frequencies to stabilize things.

    0 or - means disabled (Default)
    4 is as low as you can set it (Better performance)

    To low at certain freq. will cause issues or no boot, too high will kill memory bandwidth.

    Here is some more reading and testing on this, thanks to Massman
    [M] Stabilizing your memory overclock on Core i7 platform - Back-to-Back Cas Delay Investigated

    And
    [M] Asus Rampage Gene II Review - An Extreme 2 On A Diet?

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    Default Re: Setting RAM timings manually - "Misc timing control" section (GA-P55A-UD3R)

    Thanks again Psycho and LSD!

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