920 D0 @ 3.8Ghz; Help to 4Ghz?

Discussion in 'Processors and motherboards Intel' started by hash3m, Sep 28, 2009.

  1. hash3m

    hash3m Active Member

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    GPU:
    2x EVGA GTX 275
    MOBO: GA-EX58-UD3R -- rev. 1.6 -- BIOS FB (latest non-beta BIOS)
    CPU: i7 920 D0 @ 3.82Ghz
    RAM: OCZ Obsidian 3x2GB 1600Mhz @ 1530Mhz
    OS: Windows Vista Home Premium 64bit
    CPU COOLER: Scythe Mugen 2 (AS5)

    HT: ON
    CPU: 20x191 @ 3.82Ghz
    MEM: 8x191 @ 1528Mhz
    QPI: 36x191 @ 6.876Ghz
    UNCORE: 17x191 @ 3.247Ghz

    Vcore: 1.25v
    QPI/VTT: 1.175v
    DRAM: 1.64v

    Idle CPU 43c, not lower than 41c // Load CPU 68c, not higher than 70c

    Stable through the first four self-tests in Prime95 Small FFTs (roughly 1hr:10min). Stable through plenty of Cinebench runs. Stable through Vantage. Stable through everything I've done for a few days, including Photoshop CS4, COD4, Vantage, Crysis, The Withcer, Mass Effect, and Anno 1404. I consider this STABLE.

    I want to know what I should modify to stabilize 4Ghz. If it helps, this is how I got to where I am:

    1. I set the volts as listed above. All multipliers as listed above. Set the Base Clock to 140. STABLE.
    2. Base Clock to 150. Stable.
    3. 160. Stable.
    4. 170...180...190...Stable.
    5. 200 = BSOD pretty quick into Prime95 (almost instantly). Confirmed multiple times.
    6. 195 = BSOD within first Prime95 self-test. Confirmed.
    7. 190x21 (via TurboBoost ON, the only time throughout these trials) = BSOD within first Prime95 self-test. Confirmed.
    7. Vcore down 1 notch to 1.24375v. TurboBoost OFF (190x20). BSOD within the first Prime95 self-test. Confirmed multiple times.
    8. Vcore back up to 1.25v. VTT down 1 notch to 1.55v. BSOD within first Prime95 self-test. Confirmed twice.
    9. VTT back up to 1.75v. Vcore still back at 1.25. Base Clock up to 191. STABLE. This is where I'm at now, with specs listed at the top of this post.
    10. 4Ghz via 200x20 with various combinations of higher Vcore and VTT. All BSOD during Windows loading or Prime95 or Cinebench. The volts which allowed me to load Windows with 4Ghz seemed to put me at an idle temp of 49c, which I intend to avoid (was always accompanied by a load temp of 76+ which I also intend to avoid).

    I assume I've achieved the highest clock that these volts will maintain, and I'm very satisfied with the temps and performance. I wouldn't mind the tiny boost to 4Ghz, and I'm sure I can stabilize it if I just know what to change, so long as the idle temps don't go over 48c, and the load temps don't go over 76c. I plan on increasing the base clock in increments of 1, can you guys suggest which voltage changes should accompany these increases in order to maintain stability?

    Thanks :D
     
    Last edited: Sep 28, 2009
  2. Pyro the Dragun

    Pyro the Dragun Master Guru

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    GPU:
    Geforce GT 555M
    First off, that VTT (I'm assuming that's your boards name for the "Uncore") voltage of 1.75v is dangerously high and should be lowered immediately to 1.2-1.35v. Usually 1.75v is the kind of voltage you pump to the Uncore when you're using some type of exotic cooling. Also, that high VTT voltage may actually be causing a certain amount of instability and could be why your D0 is struggling when traditionally D0 Nehalems effortlessly OC to 4GHz+.

    Secondly, you put your QPI Frequency as 36 x 191 = 6.876Ghz. How are you getting that 36x multiplier? The only multipliers that should be available for the QPI frequency are 18x, 20x, and 22x. You should set it to 18x. If that 6.8GHz QPI frequency is true then that is most definitely the reason for instability.

    Thirdly, you might try pumping up the ICH and IOH voltages (both should default at around 1.1v) to 1.2v-1.3v (1.35v is the max within the safe zone).
     
  3. Liberalism

    Liberalism Active Member

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    GPU:
    2x XFX Radeon HD 6990 QCF
    Get two or three HD 5870s with a Core i9 and watch your systems fly! :banana:
     
  4. hash3m

    hash3m Active Member

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    The VTT is for the QPI. It was 1.175v my bad. That is stock voltage for it. The only voltage I have increased is Vcore to 1.25 because I've read that's completely safe, and it has been the lowest stable vcore at 3.8Ghz.

    Yeah the QPI frequency is 6.876Ghz. The multipliers that ex58-ud3r allows are 36x, 44x, and 48x (or "slow mode" which is 100Mhz) so I'm sure it's completely safe. I watched a couple youtube vids on overclocking 920 with Gigabyte ex58 and they said set QPI to 36x (the lowest multiplier allowed). EDIT: CPU-Z shows my QPI Link Speed as 3.438 so, in any case, it's all good. Coincidentally, this is precisely half of what the BIOS shows, and is obviously half of 36x191.

    The uncore is set to 17x, is that what you mean? Uncore = (2xMemX) + 1 (aka 17x @ 3247Mhz).

    Yeah everything is well within bounds.
     
    Last edited: Sep 28, 2009

  5. DSK

    DSK Banned

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    GPU:
    HD5770/BenQ G2220HD
    QPI/VTT

    need more mate try 1.35v

    with the same vcore.
     
  6. Pyro the Dragun

    Pyro the Dragun Master Guru

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    Ok all seems well within acceptable limits.
    Try pumping up the VTT (Uncore) to 1.3v, and yes the Uncore frequency is fine at 17x (Uncore freq. should always be 2xMem + maybe a tad more).
    The QPI Frequency is good. Apparently either Gibabyte's terminology is different or someone forget to divided all their QPI multipliers by 2 (36/2=18 hehehe) when they were writing the BIOS.
    All in all you seem to be doing a good job, just start slowly increasing the VTT, Vcore, IOH/ICH voltages and you should be golden.
     
    Last edited: Sep 28, 2009
  7. hash3m

    hash3m Active Member

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    For reals, QPI and Vcore to at least 1.35?! That's a pretty big jump just for 5% increase in base clock.

    I should mention that vcore/vtt both at the lowest setting close to 1.35 was one of the settings that put me over 48c/78c @ 4Ghz in my step 10 trials. If I really have to go so high, I think I'd prefer the temps/volts currently maintaining 3.8Ghz...
     
  8. hash3m

    hash3m Active Member

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    That's what I mean, I've done that and attained 4Ghz, but at the cost of high voltages (1.35 VTT & Vcore) which produced drastically hotter temps (+6c idle, +9c load). Also, I wasn't even able to get it stable then...

    Maybe if I could increase the VTT and Vcore by only one notch (VTT 1.95, Vcore 1.25625) and somehow adjust the IOH/ICH that would be preferable. Is the IOC the same thing as ICH (IOH is listed with the rest of my volts at the bottom of the main page, without having access sub-pages)? What do IOH/ICH do so I can understand what changing them will achieve...
     
  9. Pyro the Dragun

    Pyro the Dragun Master Guru

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    The IOH/ICH voltages are the X58 Northbridge core voltage and I believe the bus voltage for the NB (someone fell free to correct me if I'm wrong). They both have a default voltage of roughly 1.1v, increasing these voltages helps attain higher stable Base clocks. I know some people can hit 210ish Bclock without increasing these volts but generally once you hit 190-200ish it can help to bump the volts up a tad.

    As for your temperature worries, throw another fan on the air cooler? Or maybe even remount it?
     
  10. DementeD

    DementeD Master Guru

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    AMD "6970" 1000/1500
    definitely more vcore n qpi voltage..1.3 each should do it..maybe a little more..
     

  11. GhostXL

    GhostXL Ancient Guru

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    Core i9 isn't going to do much for gaming, especially when 4 cores are stll more than enough unless you do HEAVY, and I mean HEAVY multitasking.

    i7 is enough for a while. Also 3 HD 5870's will not scale well im most games. 2x is plenty.

    If you got the money fine, but just being realistic.
     
  12. phrozin

    phrozin Ancient Guru

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    GPU:
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    i run 1.35 vcore and vtt @ 1.29v mem @ 1.650v and run 200mhz (4200mhz) @24/7 you will find @1.25v vcore will be good for around 180mhz want more up the vcore to the 1.3's
     
  13. Tat3

    Tat3 Ancient Guru

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    GPU:
    GB GTX 1660 Ti OC
    DFI's seem to run with lower voltages than other boards.
    1.36V core, vtt @ 1,29(Under 1,3... At school atm) and 4,3GHz stable.
     

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