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  1. #16
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    Re: Overclocking i7 920 - 1st try 4GHz to Windows

    Mine is up to 3.7GHz, now, but hard work: it's taking 1.350V to stay there. Not finished stability testing at this speed yet. I've found that the bus seems to limit at about 205 on this board (Asus P6T): no matter what multiplier, 210 locks solid within a minute. QPI and UCLK are almost as low as they will go, but it looks like QPI will go higher (but not UCLK). RAM is good good for 1750, but current setting mean it's working about 1540! I think I've found the limits of everything except the CPU final speed, then it's just a question of the best combination.


    M

  2. #17
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    Re: Overclocking i7 920 - 1st try 4GHz to Windows

    Quote Originally Posted by Meridian View Post
    Mine is up to 3.7GHz, now, but hard work: it's taking 1.350V to stay there. Not finished stability testing at this speed yet. I've found that the bus seems to limit at about 205 on this board (Asus P6T): no matter what multiplier, 210 locks solid within a minute. QPI and UCLK are almost as low as they will go, but it looks like QPI will go higher (but not UCLK). RAM is good good for 1750, but current setting mean it's working about 1540! I think I've found the limits of everything except the CPU final speed, then it's just a question of the best combination.


    M
    Overclocking mine is hard work too. Getting to High speeds is one thing, stabilizing is another. I did not test what my maximum bus speed is, but I should. My ram is 1600MHz but I saw a test at 1800MHz. I'm running is at 1300-1400 most of the time while overclocking because I do not want it to limit the overclock.
    I tested it stable at 3570MHz (21x 170) doing 8 hours of prime. It needed 1.300v (1.280 Win) for the core and 1.275 QPI. I did not try any other voltage for this speed. 1st time was stable.
    I'm getting bluescreens at 4GHz, 3.5 hours of prime is my maximum.
    I do have to add that I'm not spending most of my time overclocking it. I just try a few times a week. The hardcore days are over I guess.
    Asus R5E, Intel Core i7 5960X
    Cascade cooling (-94C @550W)
    G.Skill DDR4 3600C15@4266MHz cas12 Nvidia GTX730, Samsung 850 Evo/OCZ Vertex 4
    and Seasonic Platinum 1200Wi, Dell Ultrasharp U2711 and 20-50 more systems...



  3. #18
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    Re: Overclocking i7 920 - 1st try 4GHz to Windows

    Up to 3.8GHz now, but it needs 1.375V and the temps are hitting 80oC. I'll call it a day for the CPU speed, but still keep playing with RAM settings etc.


    M

  4. #19
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    Oregon
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    Re: Overclocking i7 920 - 1st try 4GHz to Windows

    ^^^^Are you running 20 x 190 or 19 x 200?

    Many users have reported that the 20X multi actually requires more voltage to run clock for clock. This is true for my processor indeed. It needs 1.23v to run 19 x 200 and 1.26v to run 20 x 190.

    This is of course assuming your proc can reach 200 bclk.....

  5. #20
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    Re: Overclocking i7 920 - 1st try 4GHz to Windows

    200 x 19. BCLK will hit 205, but not 210.


    M

  6. #21
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    Re: Overclocking i7 920 - 1st try 4GHz to Windows

    ^^^Same boat....I can go to 206....210 is a sure lockup within 2-3 min of prime95.

    My theory on these chips is that basically they all have a similar wall but it just depends on how much voltage it takes to get there. I got lucky in that I have a chip that can do 3.8 with only 1.23 vcore and 1.20 vtt. It needs 1.3 for 3.9 and over 1.38 for 4.0....haven't gotten it stable yet.

    Can't wait for the D0 revision to come out

  7. #22
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    Re: Overclocking i7 920 - 1st try 4GHz to Windows

    Interesting stuff. I am testing 14x210MHz now. I am wondering how much my system can take.

    The voltages are:
    CPU: 1.300 (to lazy to lower it)
    Mem: 1.620
    QPI/VTT (Bios): 1.335v (Because this is max before Gigabyte gives digits in red).

    Uncore: 13x (12x will not boot)
    CPU: 14x
    Mem: 6x

    It's running: 33 minutes now.
    EDIT: It's running an 1 hour now. It seems stable. This is a test to know what my maximum bus speed is (at what voltage max).

    Results 210MHz test so far (updated on priming system)

    So you think that 19x has lower voltages? I didn't try this yet. Maybe 19x210 will do (if 210 is stable)?
    Last edited by Sparks; 03-07-2009 at 10:42 AM.
    Asus R5E, Intel Core i7 5960X
    Cascade cooling (-94C @550W)
    G.Skill DDR4 3600C15@4266MHz cas12 Nvidia GTX730, Samsung 850 Evo/OCZ Vertex 4
    and Seasonic Platinum 1200Wi, Dell Ultrasharp U2711 and 20-50 more systems...



  8. #23
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    Re: Overclocking i7 920 - 1st try 4GHz to Windows

    I'm not sure what the reason is, or even if it's true, but this "x19 overclocks better than x20" thing is a persistent rumour.

    And my attempt at 210 was done at x17, well within the CPU speed I had already achieved.


    M

  9. #24
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    Re: Overclocking i7 920 - 1st try 4GHz to Windows

    I stopped it after 4 hours and 40 minutes: Picture
    Last edited by Sparks; 03-07-2009 at 02:22 PM.
    Asus R5E, Intel Core i7 5960X
    Cascade cooling (-94C @550W)
    G.Skill DDR4 3600C15@4266MHz cas12 Nvidia GTX730, Samsung 850 Evo/OCZ Vertex 4
    and Seasonic Platinum 1200Wi, Dell Ultrasharp U2711 and 20-50 more systems...



  10. #25
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    Re: Overclocking i7 920 - 1st try 4GHz to Windows

    Ok, looks like it's game over. It looks like I have a dead processor.
    I decided to swap my cooling paste. After this I get F6 on my motherboards display. It's a floppy releated problem, something I do not have connected.
    I tried booting without my GFX adapter, memory in other banks or just one stick, all gave the same error. I pulled out my processor and put it in again, same problem. Clearing bios (pull out battery or pushing the buton) did not help. I disconnected all my sata, same problem.

    It looks like it's dead. I will try my memory in my brothers pc later on, I expect it to work.
    Asus R5E, Intel Core i7 5960X
    Cascade cooling (-94C @550W)
    G.Skill DDR4 3600C15@4266MHz cas12 Nvidia GTX730, Samsung 850 Evo/OCZ Vertex 4
    and Seasonic Platinum 1200Wi, Dell Ultrasharp U2711 and 20-50 more systems...



  11. #26
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    Re: Overclocking i7 920 - 1st try 4GHz to Windows

    Wouldn't it fail the self-test much earlier if the CPU was dead - like about 02? AFAIK the system checks the power, then the motherboard, then the CPU. I would expect a floppy bus check much later - after even the RAM and gfx.



    M

  12. #27
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    Re: Overclocking i7 920 - 1st try 4GHz to Windows

    When I am home I will check the pins on the motherboard (socket).
    I saw others on the internet, they said that the codes don't say to much. Some had memory problems (mem tested Ok this evening in other pc).
    If I look only at the code I would say processor is ok, that is whay i will look at the pins. I only removed the processor, I didn't touch anything else (before).
    Asus R5E, Intel Core i7 5960X
    Cascade cooling (-94C @550W)
    G.Skill DDR4 3600C15@4266MHz cas12 Nvidia GTX730, Samsung 850 Evo/OCZ Vertex 4
    and Seasonic Platinum 1200Wi, Dell Ultrasharp U2711 and 20-50 more systems...



  13. #28
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    Dec 2003
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    The Netherlands
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    Re: Overclocking i7 920 - 1st try 4GHz to Windows

    The reason for not booting is known now. A defective Mobo is the cause. A new mobo has been ordered. I hope it will arrive soon.
    Asus R5E, Intel Core i7 5960X
    Cascade cooling (-94C @550W)
    G.Skill DDR4 3600C15@4266MHz cas12 Nvidia GTX730, Samsung 850 Evo/OCZ Vertex 4
    and Seasonic Platinum 1200Wi, Dell Ultrasharp U2711 and 20-50 more systems...



  14. #29
    Joined
    Dec 2003
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    The Netherlands
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    Re: Overclocking i7 920 - 1st try 4GHz to Windows

    IT WORKS !!!!

    Same CPU, different mobo. Let's get this thing rocking again!!
    Asus R5E, Intel Core i7 5960X
    Cascade cooling (-94C @550W)
    G.Skill DDR4 3600C15@4266MHz cas12 Nvidia GTX730, Samsung 850 Evo/OCZ Vertex 4
    and Seasonic Platinum 1200Wi, Dell Ultrasharp U2711 and 20-50 more systems...



  15. #30
    Joined
    Mar 2003
    Location
    FL
    Posts
    2,745

    Re: Overclocking i7 920 - 1st try 4GHz to Windows

    Thats good news, welcome back!

    I've just started tinkering with lowering my vcore and qpi tonight on my air cooled i7, so far so good at 180x20 1.25vcore 1.2125qpi.

    Prime95 x64 v25.9 finally fixed the issue with not being able to allocate more than like 1600mb of ram so you may want to give it a shot over previous versions if you haven't already. You just goto custom and enter how much ram you want prime to use, if you use too much your rig will come to a crawl on the swap drive.

    ftp://mersenne.org/gimps/p64v259.zip
    i7 Beast: Asus P6T Deluxe, Intel i7 920 21x191 (4000) HT on 1.3875v, Swiftech GTZ/D5/BIX2
    6GB (3x2GB) G.Skill pi Black DDR3 1600, ECS 9600GT
    CM STACKER 810, PC Power & Cooling Silencer 750


    i7 Game: Asus P6T, Intel i7 920 20x180 (3600) HT on 1.275v, TRU-120
    6GB (3x2GB) G.Skill DDR3 1333 7-7-7-18, MSI GTX260 OCv2, Dell 3007WFP LCD
    CM STACKER 830, PC Power & Cooling Silencer 750


    AMD: Biostar 790GX A2+, PII X4 940BE 17x200, Freezer 64 Pro
    4GB (4x1GB) Ballistix Tracer DDR2 800, Powercolor 4850
    Corsair VX450

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