Trouble Overclocking My I7 950

Discussion in 'Die-hard Overclocking & Case Modifications' started by Matt26LFC, Jan 7, 2011.

  1. shimyns

    shimyns Ancient Guru

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    Well then, lower your block, set x8 for memory, test with p95 blend test, raise qpi volts and VRAM volts at need, raise blck until you reach 200 blck (1600). Timings should be spec, as well as initial VRAM voltage. When you're all done, run memtest86. (all this with x14/15 CPU multiple.
    Good luck
     
  2. shimyns

    shimyns Ancient Guru

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    Then, of course, on to CPU stage.
     
  3. Matt26LFC

    Matt26LFC Ancient Guru

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    Shimyns, cheers dude, i think i'll be following your advice next week. Been to work again today so not done much. I did run at 3600Mhz last night right after i got 3400Mhz stable and 3600Mhz was totally stable too, completed all 25 Runs no problem.

    Gonna run 3800Mhz now see how she rolls, just want some quick satisfaction before i start to properly test again ;)

    Screen shot of 3600Mhz

    [​IMG]
     
  4. TheHunter

    TheHunter Banned

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    hmm,

    as shimyns said 36x200 = that 7218MT/s

    maybe this is your problem QPI is set to high,.. btw, full QPI speed is 6400MT/s vs yours 4800MT/s at default.


    what if you lower blck to below 200mhz, idk ~190mhz and use higher multi, maybe that's stabler and you could get closer to 4ghz no?
     
    Last edited: Jan 9, 2011

  5. shimyns

    shimyns Ancient Guru

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    I don't understand, though, why you are at 1.396v in cpu-z (after vdroop). Seems to me that that is way too much vcore. Your CPU can withstand it (as long as it stays cool), but most core i7 950s need a lot less than that... I was on 1.168v at 3.8Ghz, albeit only tested for like 10 minutes in P95...
     
  6. Matt26LFC

    Matt26LFC Ancient Guru

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    Could be right, not sure, like i say im gonna have a proper play next week. Though im still running 200Mhz base clock and just passed 3800Mhz.


    I just haven't adjusted the voltage from when i tried to get it stable a couple days ago, i set it at 1.4v in the BIOS and haven't reduced it. As im after 4 to 4.2Ghz im probably gonna need it there anyway. I'll def reduce it if i can though.

    3800Mhz Run Passed

    [​IMG]
     
  7. shimyns

    shimyns Ancient Guru

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    Great temps you got going there.
    I don't think you'll need more than 1.3v for 4Ghz. Just reduce when you reach your mark.
    Lookin' good, man.
     
  8. Scerate

    Scerate Maha Guru

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    yeah try lowering your CPU Voltage to 1.3v or even lower for 3,8ghz your CPU is a A Batch i heard (and really heard only so please apologize and correct me if i'm wrong) that those are the best ones out of a wafer/batch.

    Myself i'm only testing LinX Maximum Memory with only 10 runs, if i got it stable i do some 8h testing with Prime95 small fft,large fft, max heat when i'm at work. Mostly for e.g. i tested my rig with 4,2ghz (203x21) with only 5runs :p but it ran nearly 1 month with V-Core @ about 1.298 without any BsoDs in gaming/encoding maybe it was even stable but yeah just a little story not relevant.
     
  9. Barton C++

    Barton C++ Master Guru

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    I've got 4GHz Prime95 Blend stable for 11hrs ! Took me three weeks (no kidding) ! LinX is very easy to get OK, mostly about VCORE.

    When I was 20 passes Linx/IBT/Linpack ect 20 passes on MAX mem OK, I had VCORE OK - P95 Blend is far from tweaked here.

    When I also had P95 Blend 7+ hours, BUT WITH BSOD, I had to find a QPI/IOH differance that matched better, in my case around 15mv (well, BELOW 15mv).

    From LinX 20 passes max mem stable (P95 Blend):
    QPI 1.375 and IOH 1.22 BSOD 9hr (15.5mv)
    QPI 1.293 and IOH 1.14 BSOD 1.5hr (15.375mv)
    QPI 1.32 and IOH 1.16 BSOD 30min (16mv)
    QPI 1.30 and IOH 1.14 BSOD 30min (16mv)
    QPI 1.287 and IOH 1.14 11hr OK ! (14.75mv)


    [​IMG]

    EDIT ///

    Dunno what the BIOS setting "CPU Amplitude Differance" 800mv really is... Maybe I can lower vcore few notches if I also set the value to 700mv? Worth testing if it's vcore/QPI volt relation !
     
    Last edited: Jan 10, 2011
  10. Mr.Joe

    Mr.Joe Master Guru

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    May I ask what your peak northbridge temps are? Remember on my ga-ex58-ud5 that toss temps were always an issue...
     

  11. Matt26LFC

    Matt26LFC Ancient Guru

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    Hey guys

    So far its looking like i need voltage, 4000Mhz failed last night with 1.4v in BIOS. This morning i cranked her up to 1.41250v in BIOS and she passed 25 Runs IBT all Maxed out.

    [​IMG]

    Im not sure what CPU Amplitude Difference does either, may have to tweak it at some point but for now Auto seems to be working for me, as does the CPU and IOH Clock Skews. According to BIOS these may enhance baseclock overclocking. So i really dont know if they relate to CPU stability or not.

    As for my NB temps i think there around 50C thats whats reported in when im in BIOS. Don't know about windows when im stressing. What tool can i use to monitor this Joe?
     
  12. Mr.Joe

    Mr.Joe Master Guru

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    Well here i see à problem straight away. Its well known but not well documented enough that the 9XX series actually don't like even milties (like your x20) and I've confirmed myself that it won't overclock nearly as good as with uneven ones ;)

    As for your temps 50+(in bios) is about the same as I got when it went up during the burning and caused the a crash.

    Everests monitoring is the one I use(d) to monitor all my temps on my old 920/950/930 ^^ btw the vcore I used to crank my 930 to 4.4@27/7 was about the same as you are on right now so maybe you should try and lower the vcore during the stressing by like 0.02v until it crashes to make sure you aren't using a too high voltage :]
     
  13. Matt26LFC

    Matt26LFC Ancient Guru

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    Yeah thats something i've also read before, but its passed this time around.

    As for volts i cant really lower it as it failed at 1.40000v and passed at 1.41250v which is only two notches higher so i could only really drop it one notch.

    I'm currently in Windows at 4200Mhz and it didn't even complete one run of IBT Max before the App Stopped Responding. Thats using a 21 Multi. May try another couple notches of Vcore taking me too 1.42500v in BIOS see what happens.
     
  14. Matt26LFC

    Matt26LFC Ancient Guru

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    Update

    I've tried for stability at 4.2Ghz so far no good. I've run 1.42500v and 1.43750v and both times i the system rebooted itself. Thus i have reverted back to stable 4Ghz settings and saved the profile.

    Tomorrow i'll follow the guide linked by shimyns and start from the beginning and see if theres any kind of improvment.

    My goals are two fold, one i'd like a 24/7 stable and fully optimsed 4.1Ghz, second is a stable 4.3Ghz for benchmarking. As im only Air cooling i feel i shouldn't push for anymore than that. One day this year im hoping for a custom watercooling system, though im probably gonna be limited to one triple rad as i want it all internal.

    Cheers for all your help so far guys, its much appreciated.

    I'll be back on 2morrow with updates with isolating my baseclock and how far/well im doing. Provided i dont get Overtime at work 2morrow ;)

    Cheers

    Matt
     
  15. Barton C++

    Barton C++ Master Guru

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    21x191 with mem @ 1530MHz and at same time lower QPI Link and NB freq could mean you could shave off lots on vcore.

    Maybe 21x195 (4.1GHz) with mem @ 1560MHz would work with your 1.4x vcore ?

    I've had NO LUCK at all with even multipliers... BSODs within minutes. 21x and 23x are nice for my rig.
     

  16. Scerate

    Scerate Maha Guru

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    Here a link about the uneven Multis, but you are right that 21x/23x needs less vcore, if i were running 21x191 i was able to to get at least LinX 25 runs ! stable with only 1.23v but i needed C-States and with them on i was unstable due to x22 Turbo on the i7 920 and on my Board i couldn't even deactivate Turbo without deactivate C-States :( funny thing i noticed is that with C-States on my Memory Bandwith increased about 5-15%

    >Link about uneven Multis<
     
  17. TeethDestroyer

    TeethDestroyer Member Guru

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    I have a 950 with a P6T Deluxe mobo and have the same problems as you: couldn´t go further than 179 blck with every volt I have tried and multi...

    Can you put the bios settings of your successfuly overclock?.

    Now Im running 3.6 ghz, HT on with 1.1875 core, but 1.32 QPI and 1.24 IOH (I have a SLi and one tell me about elevate this voltage up to 1.24).

    Only can achieve 4 Ghz (and don´t know if is stable or not, with 175x23) but everithing on auto (like memory and rest). If I try different value then system not run.

    Thanks.
     
  18. Matt26LFC

    Matt26LFC Ancient Guru

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    Hey dude, got home from work tonight and decided to do something similar to what you've suggested here.

    I've gone 180Mhz Baseclock + 23Multi = 4151Mhz - I've also upped my memory divider to 8 giving me around 1400Mhz on my memory. Not tested properly yet ran 10mins of Prime95 Blend and not issues, all the tests pretty much ticked over in parallel too which was nice to see.

    All my voltages are still the same for the moment, gonna run full IBT in the morning when i get up, then work in reducing those voltages if i can.

    You can see all my settings in my first post. The only difference between those screenshots and my stable 4Ghz are as follows

    CPU Multi = 20
    DRAM Multi = 6
    CPU Vcore = 1.41250

    Every other setting is the same.
     
    Last edited: Jan 11, 2011
  19. Barton C++

    Barton C++ Master Guru

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    GL !

    The fifth timing in "8-8-8-24-74" ("74"), tREF I've raised (82, 88 and 90 are next possible values) to gain stability. In my case I also could lower lots IOH and QPI volts, probably vcore too since it got stable, would have needed more otherwise.

    If I only had 1200MHz memory, oc would be "easier"; just use the lowest mem multi... but to have mem at 1600MHz has a negative effect on vcore !
     
  20. Matt26LFC

    Matt26LFC Ancient Guru

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    Hey all, just completed a 25 Run of IBT @ 4.15Ghz, had to make an adjustment as it still seems i cant run 1T on my memory, set it to 2T. Thought my memory was rated for 1T perhaps its not. I'll have to look into it some more.

    Included in the screen shot is an AIDA shot of memory performance, im not sure its as high as it should be. When im done tweaking Vcore and VTT/QPI i may try and play with those timings a little more, try and tighten things up a bit.

    Screenie

    [​IMG]
     

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