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




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

    Ok. I see at least one person on this forum is fine with "high" QPI/VTT (1.48V). I have read others who also think the cpu will be fine. But I don't know why some people are saying it's too high and others are saying it is fine. Gigabyte's X58A-UD3R rev.2.0 BIOS is now rev.FB. The BIOS warns that QPI/VTT at 1.48 is not "safe" by coloring the number in MAGENTA. But it is not colored with the BLINKING RED warning given to even higher voltages. And what is the safe max for QPI PLL, which is 1.4V on my overclock? Maybe it is because of 12 gigs at 1600 that the QPI/VTT is so high. Where can I go to find out what kind of damage this V is supposed to do to my CPU? What does Gigabyte mean with the MAGENTA colored warning.

    I've tried to lower the QPI/VTT by raising the VCORE and DRAM voltages. But I can't lower it to 1.3 without lowering BLCK to less than 140. But if I do that then I wouldn't get much of an overclock.

    Help.

    X58A-UD3R rev.2.0
    i7 930 D0 3.6GHz
    Scythe Mugen 2
    12 gig 1600 9-9-9-24 Corsair CM3x2G1600c9

    NOTES: UNCORE FREQUENCY at 16x didn't boot. Basically, I like my overclock. Mostly, CPU and MCH stay between high 30degC and high 40degC for most of what I do. System is stable on intel Burn Test set to VERY HIGH.

    Advanced CPU Features:
    CPU Clock Ratio ............................. [18x]
    DP Frequency ................................ 3.60GHz (200x18)

    Intel(R) Turbo Boost Tech ................... [disabled] disabled if you have 930 chip
    CPU Cores Enabled ........................... [All]
    CPU Multi Threading ......................... [Enabled]
    CPU Enhanced Halt (C1E) ..................... [Disabled] use balanced profile in win7 power saving options
    C3/C6/C7 State Support ...................... [disabled]
    CPU Thermal Monitor ......................... [Enabled]
    CPU EIST Function ........................... [disabled]
    Virtualization Technology ................... [enabled]
    Bi-Directional PROCHOT ...................... [Enabled]

    Uncore & QPI Features:
    QPI Link Ratio .............................. [x36]
    QPI Link Speed .............................. 7.xxGHz
    Uncore Frequency ............................ [x19]
    Isonchronous Frequency ...................... [Enabled]

    Standard Clock Control:
    Base Clock (BCLK) Control ................ [Enabled]
    BCLK Frequency (MHz) ..................... [200]
    PCI Express Frequency (MHz) .............. [Auto]


    Advanced Clock Control:
    CPU Clock Drive ............................ [800mV]
    PCI Express Clock Drive .................... [900mV]
    CPU Clock Skew ............................. [0ps]
    IOH Clock Skew ............................. [0ps]

    Advanced DRAM Features:
    Performance Enhance .................... [Turbo]
    Extreme Memory Profile (X.M.P) ......... [Disabled] --> Disable XMP and manually adjust your ram latencies
    System Memory Multiplier (SPD) ........ [8.0]set to this to give you 1600mhz ram speed
    Memory Frequency (Mhz) ................ 1600 will set it to 1440mhz due to 180bclk
    DRAM Timing Selectable (SPD) .......... [Quick]
    Profile DDR Voltage ................... xxxxV
    Profile QPI Voltage ................... xxxxV
    Channel Interleaving .................. [Auto]
    Rank Interleaving ..................... [Auto]

    Channel A + B + C

    Channel A Timing Settings:
    ##Channel A Standard Timing Control##
    CAS Latency Time ........................... 8 [9]
    tRCD ....................................... 8 [9]
    tRP ........................................ 8 [9]
    tRAS ....................................... 24 [24]
    set according to ram



    ##Channel A Advanced Timing Control##
    tRC ........................................ [Auto]
    tRRD ....................................... [Auto]
    tWTR ....................................... [Auto]
    tWR ........................................ [Auto]
    tWTP ....................................... [Auto]
    tWL ........................................ [Auto]
    tRFC ....................................... [Auto]
    tRTP ....................................... [Auto]
    tFAW ....................................... [Auto]
    Command Rate (CMD) ......................... [Auto]

    ##Channel A Misc Timing Control##
    B2B CAS Delay .............................. [Auto]
    Round Trip Latency ......................... [Auto]

    Advanced Voltage Control:

    CPU
    Load Line Calibration ...................... [auto]
    CPU Vcore .......................... 1.2375V [1.20625v] also look for dvid in bios and set to normal
    QPI/VTT Voltage .................... 1.175V [1.480v] or 1.3000v may need more if unstable
    CPU PLL ............................ 1.800V [1.800v]

    MCH/ICH
    PCIE .............................. 1.500v [auto]
    QPI PLL ........................... 1.100v [1.400v]
    IOH Core ........................... 1.100v [1.100v]

    ICH I/O ............................ 1.500v [auto]
    ICH Core ........................... 1.100v [1.100v]

    DRAM
    DRAM Voltage ....................... 1.500V [1.500V]
    DRAM Termination ................... 0.750v [AUTO]
    Ch-A Data VRef. .................... 0.750v [AUTO]
    Ch-B Data VRef. .................... 0.750v [AUTO]
    Ch-C Data VRef. .................... 0.750v [AUTO]
    Ch-A Address VRef. ................. 0.750v [AUTO]
    Ch-B Address VRef. ................. 0.750v [AUTO]
    Ch-C Address VRef. ................. 0.750v [AUTO]

  2. #2
    Acebmxer's Avatar
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    Default Re: I feel unsure about: QPI/VTT 1.48...QPI PLL 1.4

    Intel says max qpi/vtt is 1.35 Some people run up to 1.4 for 24/7 use. I wouldnt run any higher then that. You can run up 1.5 maybe 1.6 but I would only do that for benching.

    bclk, Uncore and memory speed are affected by qpi/vtt voltage. Vcore or vdimm wont help lower qpi/vtt.

    QPi/vtt must be no lower then 0.5v from vdimm.

    Uncore must be 2x memory or +1 or +2 multi.

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

    its because of your ram 12gb's that it needs that much,you could try with system performance enhance on standard and see if it lets you lower qpi/vtt,bios's vary too,some need more voltages and some need less you need to find one thats stable and uses less voltage for qpi,you can try loosening timings too to lower qpi/vtt

    for uncore freq you can use 16x 17x 18x,i like to use the middle number of 2xram multi, +1+2
    Gigabyte z77x UP4-TH F11c Modded Bios
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  4. #4
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    Default Re: I feel unsure about: QPI/VTT 1.48...QPI PLL 1.4

    Thank you for responding, Acebmxer and wazza300. :)

    --"look at sig for bsod codes."
    The computer will not even start posting if I raise BCLK and keep QPI/VTT at 1.34. The screen remains blank. The Gigabyte logo screen does not even show.

    --"QPi/vtt must be no lower then 0.5v from vdimm."
    The problem is that QPI/VTT wants to be within 0.02 of VDIMM.

    --"Uncore must be 2x memory or +1 or +2 multi."
    --'for uncore freq you can use 16x 17x 18x,i like to use the middle number of 2xram multi, +1+2 "
    UNCORE does not seem to have relevance here; other factors seem to have greater weight. The problem seems to be that occupying all six memory slots on my motherboard means I cannot raise BCLK over 140 without raising QPI/VTT over 1.34. In other words, I can either not overclock my cpu and enable XMP to raise RAM speed to 9-9-9-24 at 1596 or overclock my cpu just slightly and run RAM at 8-8-8-20 at around 1100.

    --"you could try with system performance enhance on standard and see if it lets you lower qpi/vtt,"
    That didn't help. The problem still seems to be 6 RAM sticks.

    --"you can try loosening timings too to lower qpi/vtt"
    I tried 13-13-13-30 at 1600. I didn't even get to the Gigabyte logo screen.

    ...
    Oh, no. Does this mean that you cannot safely and substantially overclock an i7 930 with 6 sticks? :(

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

    i think your safe with that voltage for 12gb,the integrated memory controller is handling 12gb's of memory not 6gb so it will need a fair amount
    Gigabyte z77x UP4-TH F11c Modded Bios
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    Default Re: I feel unsure about: QPI/VTT 1.48...QPI PLL 1.4

    --"i think your safe with that voltage for 12gb,the integrated memory controller is handling 12gb's of memory not 6gb so it will need a fair amount"

    Hello, wazza300. Well, my biggest problem is that I am almost completely ignorant about circuitry. ^^; So what I don't really understand is how electricity powers chips and the nature of damage improper voltage would inflict on my chips. I am not looking for anyone here to teach me what I should learn on my own. Rather, I am wondering whether Intel's advisement to keep QPI/VTT V under mid-1.3x is because the IMC physically is unable to deal with more, regardless of how the energy is used. Let me explain.

    Let's say we have a PIPE A (IMC) of diameter X. This pipe leads to a three-way fork of pipes, each of diameter Y, where X>Y. Let's say that PIPE A can withstand a maximum of 1.6"V" of water without shortly bursting. For maintenance reasons, PIPE A would last significantly longer if at most 1.34V of "pressure" flowed through it.

    Now, in a second setup, let's say that we have a PIPE B (IMC) identical to PIPE A of diameter X. But in this setup, PIPE B leads to a six-way fork of thinner pipes, each of diameter Y, same as above. In this setup, perhaps, more water could safely and more quickly exit PIPE B than PIPE A. But if so, would PIPE B itself, structurally, be able to handle the initial increased "pressure?" Or does increasing the paths for exiting current allow us to reappraise the relationship of V and the soundness of PIPE B? :/

    Or is this analogy utterly faulty?

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

    i think intels stating 1.35v at stock clocks,all overclocking is a risk you take yourself,i havnt read of any chips going pop from high qpi/vtt,its all up to you and how you want to treat your hardware,you can always lower your oc or reduce memory capacity if you dont like using high volts,i think 12gb would run better with stock cpu clocks? idk
    Gigabyte z77x UP4-TH F11c Modded Bios
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    Default Re: I feel unsure about: QPI/VTT 1.48...QPI PLL 1.4

    Hello, wazza300.

    Oi. Considering that the only thing I don't like about my overclock is the QPI/VTT is frustrating. ^^; Temps are low. Vs seem low everywhere else. Burn tests say the system is stable.

    Perhaps you are right. Maybe XMP enabled and stock cpu speed is best. :(

    Thanks for your advice. :)

  9. #9
    Acebmxer's Avatar
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    Default Re: I feel unsure about: QPI/VTT 1.48...QPI PLL 1.4

    I did a a test on my setup with xmp enabled it sets bclk to 143 and memory multi to 14. I set uncore to 25 and qpi/vtt to auto. Booted into windows and it set qpi/vtt to 1.5xx something. I didn't try seeing what it actually took by manually setting and lowering until i lost stability. but I can say 1600-2000 you will never see the difference except in benchmark. Now with bclk at 215 and 8x memory (1720 mhz) 18x uncore I only need 1.335 qpi/vtt

    When I said qpi/vtt must not be lower then 0.5 of vdimm that means you will damage stuff if you run 1.2 qpi/vtt and 1.8vdimm. If you want/need to run 1.8vdimm you need no less then 1.300 qpi/vtt you can run as much as you. Each cpu has its sweet spot some need more then others.

    Also just noticed you have a 930 not a 920... with a 930 you will be using 21x cpu multi not the 22x. and must 930 dont scale well like the 920's. My 930 toped out at 4.2 and it needed a crazy amount of vcore and qpi/vtt compared to my 920.

    I say your fine you might be able to push towards 4.0 ghz just up the multi to 21 and increase vcore and watch your temps.. If you want to push the blck more your gonna have to drop ram multi and/or uncore.
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    Default Re: I feel unsure about: QPI/VTT 1.48...QPI PLL 1.4

    Here is why we increase voltages when we overclock. In a sense imagine a graph of frequency a wave going up and down aiming up towards a stock voltage line, right underneath it is the 1 line, then when the wave goes down there is a 0 line and a lower voltage line. Forget about the low line/0 line b/c that one is not the issue on npn transistors 0 voltage is close, 1 is open the electron holes, ok so you don't need to worry other than 0 is off 1 is on, now normal operation the wave goes up and down hitting 1 when nessecary and 0 when nessecary, when we increase the frequency the frequency gets shorts so you are hitting everything much faster than at stock, now when this happens the top of the frequncy curve is lowered in a sence it barly hits the 1 line when it aims for stock voltage line, so we increase the voltage line it aims for so the wave shoots up higher theoretically sucessfully hitting the 1 line even though it cant hit the voltage line, as frequency increases again the line it aimed for still is not high enough, so we increase that voltage line again so it hits teh 1 line, so on and so forth. Its not a perfect solution, but it works. Now we begin to hit barriers with voltage as in heat, if you can bring down the heat on semiconductors then you stabilize the voltage and the transistors, if you push to much voltage you can cause votlage to blow through the transistor gates that need to be close. you blow through a transistor gate and the processor is basically ****ed, but you do have almost a billion transistors like 700-800million in i7 900 series except the hexa cores are over a billion.

    Back to the subject intel states 1.55 to be absolute maxium voltage and intel also says going over and coming back can result in irreversible damage. You have to realize the IMC that is basically what your pushing all those volts through is part of the processor, you have your core and uncore, uncore containing L2 cache IMC(integrated memory controller) and so on and so forth, 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.

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