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Thread: I feel unsure about: QPI/VTT 1.48...QPI PLL 1.4




  1. #11
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    Default Re: I feel unsure about: QPI/VTT 1.48...QPI PLL 1.4

    Hello, sin0822.

    Thank you for the brief lesson. It was helpful. :)

    --" as a rule of thumb i dont push more voltage through my processor than i would want to put through my cores, just be warned."

    This is a good way to think of it. Thanks. :)

  2. #12
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    Default Re: I feel unsure about: QPI/VTT 1.48...QPI PLL 1.4

    Hello, Acebmxer.

    Unfortunately, our experiences seem to be different. May I ask how many sticks you are working with? With 3 sticks, my QPI/VTT ceases to be an issue. It is when I install 6 sticks and want to raise my BCLK over 140 regardless of XMP on-off status that I am forced to raise my QPI/VTT closer to 1.5. I was aware of the advisement to keep QPI/VTT within 0.5 of VDIMM. What I meant was that I was in no danger of this particular issue. This is because, with my VDIMM Intel burn test stable at 1.5 for 9-9-9-24 at 1600, my actual concern is that QPI/VTT is within 0.02 of VDIMM with V of 1.48. 1.46 was not perfectly stable according to the burn test, though the system seemed to work alright.

    As I wrote in my first comment, I wanted an 18x200 (cpu multixBCLK) for 3.6GHz and ram speed of 9-9-9-24 at 1600. I was mistaken about one note above: I am indeed able to run 16x Uncore without issue. 16x keeps UNCORE frequency 2x memory frequency.

    Even with QPI/VTT at 1.48, everything else was fine. Temps stayed between high 30degC to high 40degC. I know I did surpass 60degC during the burn tests after 4 passes. But temerature does not seem to be a big issue for my system.

    But keeping in mind your advice to keep the Uncore clock ratio and system memory multiplier at a ratio of 2:1, I decided to try 20:10 instead of 16:8. This led to some results good and bad.

    The good news is that the system was stable on the intel burn test set to "very high" with QPI/VTT set to a minimum of 1.34 and VCORE at 1.3, which I have not had a chance yet to lower. Cpu temps did not reach 70degC according to my BIOS PC Health function. And memory timings ran at 9-10-9-24. Memory frequency was 1750 and cpu frequency was 3.676.

    The problem was that the system could not endure 3 passes of the Intel burn test set to "maximum."

    What would you advise? Should I keep the 20:10 uncore-memory ratio?

    And what does it mean that the system was unstable only in the most stressful tests?
    ^^;

  3. #13
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    Default Re: I feel unsure about: QPI/VTT 1.48...QPI PLL 1.4

    I only have 6gb of ram 3x2gb sticks.

    as far as your uncore goes you can run it as high as you like. Must cpus top out around 4ghz on the uncore some will do more. The higher the better performance but the trade off is having to raise qpi/vtt voltage the more you push the uncore. I try to keep my uncore 2x+2 of memory multi

    If intel burn test is stopping after "X" number of runs you have to increase or decrease voltages. It means your almost stable. Your stable enough not to get a bsod but not stable enough to finish the amount of runs you told it to run. Try increasing vcore or qpi/vtt more. Most likely not enough vcore.
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  4. #14
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    Default Re: I feel unsure about: QPI/VTT 1.48...QPI PLL 1.4

    How do you fellas feel about VCORE at 1.4-1.45 for i7 930?

  5. #15
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    Default Re: I feel unsure about: QPI/VTT 1.48...QPI PLL 1.4

    vcore? u mean qpi? yh i think 1.4 is ok,use a 21x multi for cpu it should use less voltage
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  6. #16
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    Default Re: I feel unsure about: QPI/VTT 1.48...QPI PLL 1.4

    vcore ok upto 1.45 for 24/7 probably with good cooling. I woudlnt go over 1.4 for qpi 24/7 unless its a system your going to replace parts in a lot. LIke change processors and motherboards to overclock, some of us do and we run higher voltages, the majority dont and should observe the safe votlage limits.

  7. #17
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    Default Re: I feel unsure about: QPI/VTT 1.48...QPI PLL 1.4

    I installed my 930 back in and currectly testing 21x200 8x memory for 1600 and 18x uncore @ 1.35vcore and 1.335 qpi/vtt. First run at 1.315vtt bsod error 124 as soon as i started linx. Take note my 920 only needs 1.4vcore and 1.335 vtt for 21x215 and 8x memory 18x uncore.

    1.4-1.45 vcore is ok for 24/7 if temps are in check. I would keep core temps under 80c for 24/7 use.
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  8. #18
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    Default Re: I feel unsure about: QPI/VTT 1.48...QPI PLL 1.4

    Right now, I am not certain, but I believe that the Intel burn test corrupted W7. Twice. After crashing a bunch of times, I became unable to access Windows. I had another harddrive that also had W7 on it because I am making two identical systems. After crashing on the second drive, I am now forced to reinstall W7 to see if that will fix the problem.

    These are the latest BIOS alterations I have made before losing access to the Windows environment. It was stable for at least 5 passes on the Intel burn test. Temps never reached 60degC, according to the BIOS PC Health warning system.

    CPU Clock Ratio...21 x
    Turbo...off
    C1E...off
    EIST...off
    QPI Clock Ratio...x36
    Uncore Clock Ratio...x20 <--[2(Mem Multi)+2] has not worked for me yet.
    BCLK Frequency...175
    X.M.P....off
    System Memory Multiplier...10.0
    --CPU Frequency-->3676
    --QPI Link Speed-->6.36
    --Uncore Frequency-->3500
    --Memory Frequency-->1750

    Performance Enhance...Standard
    DRAM Timing Selectable...Quick
    --9-10-9-24

    VCORE...1.2
    QPI/VTT...1.34
    CPU PLL...1.8
    VDIMM...1.5
    ICH CORE...1.1
    IOH CORE...1.1
    QPI PLL...1.1

    DRAM...1.62

    I reasoned that the VCORE must be fine lower. I figured out that I needed to raise VDIMM to at least 1.62. That is what finally helped me reach 5 passes on the Intel burn test with Custom memory allotment of 10500. V less than 1.62 VDIMM has never failed to crash the system after a second pass on maximum memory setting, even on Load Optimized Defaults. So I went back to 1.62. I decided to see if the system could endure 20 passes. I ended up falling asleep reading a book early in the morning. When I woke up in the early afternoon today, I discovered W7 could not be accessed. I am hoping that the harddrives are physically fine because I would hate it if I damaged two good, pretty new, Western Digital 640 Blacks.

    Obviously, these values do not make my system completely stable. I am now going to reformat and reinstall W7 and try stress testing again. Please continue to comment here with any advice for me. Do you think I messed up somewhere in the hardware assembly? I do not think I have considering that, while not completely stable, the system can run full load with low V and temps. Also, do you think testing during cool nights vs hot days should significantly affect testing results? My room is not climate controlled. Thank you.

    :)

  9. #19
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    Default Re: I feel unsure about: QPI/VTT 1.48...QPI PLL 1.4

    dont re-install windows yet,put in the win7 install disk and run a start up repair,you may have to do it a few times to correct any errors,also you might be able to do a system restore from the install disk
    Gigabyte z77x UP4-TH F11c Modded Bios
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  10. #20
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    Default Re: I feel unsure about: QPI/VTT 1.48...QPI PLL 1.4

    Hello, wazza300.

    On my first corrupted disk, Windows was unable to recover or restore. It apparently has a number of problems now. I think a fresh install is unavoidable.

    I was finally able to enter the W7 environment on my second OS disk. But then Explorer crashed. And it has crashed every subsequent time I have entered it. The problem seems unrelated to BIOS because resetting the values has not helped.

    Is my experience abnormal? Can stress testing actually damage Windows data? I suppose if you keep crashing and BSODing as a result of testing, then this is a possibility. :/

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