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Thread: Need help with new memory

  1. #1
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    Default Need help with new memory

    Hi guys

    as previously stated in another thread ( I don't want to hijack it) I've just purchased, and installed this morning, 16GB G-Skill Sniper F3-12800CL7D-8GBSR Memory....

    CAS Latency7-8-7-24-2N
    Capacity 8GB (4GB x2)
    Speed DDR3-1600 (PC3 12800)
    Test Voltage 1.6 Volts

    I'm having big trouble in running it in 16Gb format. I purchased the ram as 2 - 8 GB kits made up of 2 x 4GB sticks. All four sticks are sequential in serial numbers suggesting they are all of the same batch and should match up.

    Deton suggested I'd need a big boost in QPI and I'm just wondering where that should be at as a starting point and high can I go?

    Scenario:
    Motherboard Gigabyte GA-Z68X-UD7
    GPU's X-Fire Sapphire HD6970 x 2
    OS Drive SSD
    Cooling: Corsair H100 with push/pull exhaust
    Temps on load at 4.0GHz approx 49c


    Current stability with 8GB Ram

    CPU overclocked to a modest 4.0GHz (I've been running it at 4.8GHz for sometime stable.)
    LLC - 7
    Vcore @ 1.30v (it was stable on less)
    Current QPI/VTT is @ 1.160v
    System Agent Voltage 0.925v
    CPU PLL 1.56v

    When I increase my ram to 16GB I set RAM to XMP, and boost my Vcore a couple of notches, also increase my QPI/VTT to 1.20v, reboot and it freezes when going through the memory stage I force restart and it returns with the overclocking failed screen and computer reverts back to defaults and restarts ok, and in CPU-Z Ram timings are at 11-11-11-28. On one occasion I got a blue screen when it was in it's default mode rendering a 124 fault.

    Now I have tried both sets of sticks individually in both sets of sockets and they all work fine, I have even intermingled them to see if this may reveal an issue, with none. I have run the Windows memory diagnostic without fault.7

    Soooooo....where to from here - any ideas?




  2. #2
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    Default Re: Need help with new memory

    4G ram is tough to overclock yet 16G. Running at stock or slightly abouve is probably your only option. You will have a tough time overclocking CPU too. That much ram puts stress on the IMC. Why do you need so much memory?

  3. #3
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    Default Re: Need help with new memory

    He has SB board so there is not much with OC the RAM.

    @LL; let's me see if I understand your problem.
    You want to run the memory at stock and specs with manually input the CAS and it won't boot but it works when you select XMP then the timing loosen to 11-11-11-28 instead of 7-8-7-24, right?

    Can you also take CPU-Z screen shot of the memory tabs?

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    Default Re: Need help with new memory

    Quote Originally Posted by Deton View Post
    He has SB board so there is not much with OC the RAM.

    @LL; let's me see if I understand your problem.
    You want to run the memory at stock and specs with manually input the CAS and it won't boot but it works when you select XMP then the timing loosen to 11-11-11-28 instead of 7-8-7-24, right?

    Can you also take CPU-Z screen shot of the memory tabs?
    I'd prefer to be able to run my memory at the 7-8-7-24 whether that is by manual input or via XMP, I don't mind either way.

    And yes, it will run in XMP mode but only aftr loosening the timings to 11-11-11-28.

    I have been able to run this memory is 8 GB formation using the 7-8-7-24 both manually via XMP

    The image you asked for:

    Attached Thumbnails Attached Thumbnails Need help with new memory-16.jpg  

  5. #5
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    Default Re: Need help with new memory

    can't see your screen shot as a group like that. Can you post it individually?

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    Default Re: Need help with new memory

    Quote Originally Posted by Deton View Post
    can't see your screen shot as a group like that. Can you post it individually?
    Try this link Deton

    http://www.outclassed.co.nz/16.jpg


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    Default Re: Need help with new memory

    click the link above the first pic Deton.

  8. #8
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    Default Re: Need help with new memory

    Quote Originally Posted by smduff View Post
    click the link above the first pic Deton.
    lol...wasn't thinking of doing that

    @LL; nothing wrong with your RAM, you just didn't understand its specs.

    Ok, with XMP it should runs at 1600Mhz with CAS as 7-8-7-24 at 1.6v, no matter if 8GB or 16GB. Like I said, you need to up the QPI voltage because when you have high capacity modules install it taxes a lot on the memory controller. You might have to go over 1.20v though.

    Here you can try, select XMP setting then go into RAM timing manually input the CAS according to its specs, don't leave it on Auto or it will select JDEC #6 profile because of your overclocked base clock. You OC it over 100Mhz didn't you? this why your RAM timing jumped to 11 because your RAM is OC accordingly to the Blck.

    The timings should jump to 11 when you select XMP setting though. It never happen to me with all the XMP RAM I have. It just something you miss with the settings, if you still have with the problem after you try my suggestion then you can post your BIOS screen shot next. I might spot the wrong doing you did. It's very hard to guide someone in the blind and never have the same mobo.

    Edit: never mind about blck overclock, I just saw your CPU-Z screenie, you didn't OC it.

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    Default Re: Need help with new memory

    Quote Originally Posted by Deton View Post
    lol...wasn't thinking of doing that

    @LL; nothing wrong with your RAM, you just didn't understand its specs.

    Ok, with XMP it should runs at 1600Mhz with CAS as 7-8-7-24 at 1.6v, no matter if 8GB or 16GB. Like I said, you need to up the QPI voltage because when you have high capacity modules install it taxes a lot on the memory controller. You might have to go over 1.20v though.

    Here you can try, select XMP setting then go into RAM timing manually input the CAS according to its specs, don't leave it on Auto or it will select JDEC #6 profile because of your overclocked base clock. You OC it over 100Mhz didn't you? this why your RAM timing jumped to 11 because your RAM is OC accordingly to the Blck.

    The timings should jump to 11 when you select XMP setting though. It never happen to me with all the XMP RAM I have. It just something you miss with the settings, if you still have with the problem after you try my suggestion then you can post your BIOS screen shot next. I might spot the wrong doing you did. It's very hard to guide someone in the blind and never have the same mobo.

    Edit: never mind about blck overclock, I just saw your CPU-Z screenie, you didn't OC it.
    Tried all that with no luck - I'll clear my CMOS and start fresh to see if that helps.

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    Default Re: Need help with new memory

    Have you check VQL for the memory to see if it is compatible with your board?

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    Default Re: Need help with new memory

    Quote Originally Posted by Deton View Post
    Have you check VQL for the memory to see if it is compatible with your board?
    Yes I have and yes it is.

    Interestingly I have cleared my CMOS, loaded optimized defaults and changed XMP to Profile 1 (that's the only option)

    The computer starts up at 3.8GHz everything else is set to auto/BIOS defaults, the system loads and when I check the memory tab in CPU-Z it says 8-8-7-24

    So the next question is this, if XMP is 7-8-7-24 why is it at 8-8-7-24?



    Need help with new memory-8.jpg

  12. #12
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    Default Re: Need help with new memory

    good question. Leave anything where it at, now just try to change the CAS to 7-9-7-24 to see what happen.

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    Default Re: Need help with new memory

    Quote Originally Posted by Deton View Post
    good question. Leave anything where it at, now just try to change the CAS to 7-9-7-24 to see what happen.
    Changed CAS from Auto to Expert then changed the timings from Auto to 7-8-7-24 and that is what is now showing in CPU-Z.

    Of note here is I have taken my system back to 8GB. I have tried the system with both lots of 8GB to see if the problem was with both lots, and in both lots of DIMM sockets....It was.

    Now I'll try with current settings with 16GB of RAM and see what happens

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    Default Re: Need help with new memory

    Here's where I am at.

    4 Sticks of 4GB RAM

    BIOS is on default settings - everything on AUTO
    I change the RAM settings to XMP - Profile 1

    Reboot machine with 2 sticks of RAM in - BIOS says settings for XMP are 7-8-7-24 - Result in CPU-Z = 8-8-7-24
    Reboot Machine with other set of RAM in - BIOS says settings for XMP are 7-8-7-24 - Result in CPU-Z = 8-8-7-24

    Changed settings in BIOS to force CAS to 7-8-7-24 - Result in CPU-Z = 7-8-7-24
    Same with other set.

    Take all four sticks and put them into machine - set RAM to XMP Profile 1 and force CAS to 7-8-7-24 Result = Crash before BIOS completes, restarts automatically with backup BIOS and loads to windows. CPU-Z shows 11-11-11-28.

    Not too sure where to from here. Is this RAM faulty perhaps because even XMP doesn't load properly at default settings. Maybe I should contact G-Skill in their forum for some help?

  15. #15
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    Default Re: Need help with new memory

    you can do that but here is the thing if they can run as 7-8-7-24 without a problem then you shouldn't be worry about it.

    What BIOS say when you put the CAS on Auto, the same as in CPU-Z?

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    Default Re: Need help with new memory

    I have only been able to run it at 7-8-7-24 with 8GB not 16GB and then only by manually altering the CAS - XMP fails to provide 7-8-7-24

    So latest TEST RESULTS

    16GB Default BIOS settings XMP Disabled - CPU-z = 11-11-11-28
    16GB Default BIOS settings XMP Enabled - Profile 1 (7-8-7-24) - CPU-z = 8-8-7-24
    16GB Default BIOS settings XMP Enabled - Profile 1 CAS forced to 7-8-7-24 Fails to boot to windows - crashes with Overlcock/overvoltage failure - defaults to standard BIOS and loads windows CPU-z = 11-11-11-28

    If I set the BIOS to default without XMP then BIOS says standard is 11-11-11-28
    If I set BIOS to default with XMP enabled then BIOS says standard is 7-8-7-24 but alwys shows up as 8-8-7-24 unless I force CAS to 7-8-7-24 and then only with 8 GB.

    I really appreciate your help Deton!

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16gb ram stable at 1.56v

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pairing 7-8-7-24 and 7-8-8-24

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