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Thread: i7-3820 and ASUS P9X79 4.6GHz - Prime 95 Fails!

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    i7-3820 and ASUS P9X79 4.6GHz - Prime 95 Fails!

    Hi,

    I went ahead and turned on "auto tuning" from AI Suite 2 and now I have 4.6GHz with my CPU. But when I run torture test from
    Prime 95, it freezes and I get the blue-screen. I have ThermalTake Contac30 installed and I think ASUS went too far with the OC, don't you guys think? It looks like it's not stable. I can't even run it for 5 minutes. And then I said to myself, I didn't need that much of an OC from 3820 and perhaps I can just bring it down. 4.2 or even 4.0GHz will be enough for me. Can anyone clearly explain to me how to reset this 4.6GHz and drop it down to 4.2/4.0 GHz. I am new to overclocking so I don't want to burn anything, lols...

    My specs:
    ASUS P9X79
    i7-3820
    32GB DDR3 1600MHz CL9 Corsair Vengeance
    XFX HD7750
    Contact 30 as cooler.
    Cooler Master 750W + 80 Plus Bronze

    What should I enter in bios as BCLK frequency and for CPU Ratio to drop it to 4.2/4.0GHz? I can't seem to undo my 4.6GHz OC.
    By the way, should I switch back to normal mode? I mean, I have switched the TPU mode on the motherboard.

    Please help guys.

    Thanks.

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    Re: i7-3820 and ASUS P9X79 4.6GHz - Prime 95 Fails!

    Are you monitoring what temps you are getting when running stress tests?
    If not use this: http://www.techpowerup.com/realtemp/
    Your 3820 is rated to run at 66.8*C, so as long as your temps are below this try increasing the voltage a tiny bit at a time until you get a stable OC. You might need to reduce the clock-speed if it begins to get too hot with the voltage increases.

    With AI suite 2, I had some problems getting the settings I set the CPU to stay. What I ended up doing is using AI suite to tweak the settings to get a stable OC, then write down the settings and set the BIOS to that.

    I haven't used the TPU switch. Having this switched on might be what is stopping you undoing your 4.6Ghz OC.
    Try switching off the TPU then re-do your overclock. There is a feature with the AI Suite that does the same as switching the TPU on. Open the Suite, go to 'TurboV EVO' then the tab at the top called 'Auto Tuning GPU boost'. Run that and you should get to a similar OC to your 4.6GHz. Then re-test with Prime 95 & realtemp, you will probably need to re-adjust the settings to get a fully stable OC with decent temps.
    When I used this feature on my 3770k, it set it to 4.5Ghz but I was hitting 80*C and it wasn't fully stable. The Asus auto-tune feature is good for giving you a rough Idea of your chips potential, but wont produce the most stable OCs, you still need to do a little tweaking.

    p.s. im not familiar enough with the 3820 chip to know what settings work well with it. You'll need to try a few settings to find your optimal setup (there are plenty of guides out there for how to do this). But For a 4.2Ghz try 100Mhz BCLK and 42x multiplier. Multiplier scaling works better than BCLK increases with IB chips from my experience (and what I've read)
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    Re: i7-3820 and ASUS P9X79 4.6GHz - Prime 95 Fails!

    Thank you so much man. You had excellent ideas. And I think you may be right about various things. AI Suite just kind of bumps it up but we have to like tweak it after that. I will go ahead and clear the CMOS and try 100MHz BCLK and 42x cpu ratio, and then I see what happens.

    I will stop TPU swtich. I was getting around 65c degrees with the stress tests. But it only failed with "In-place large FTTs (max heat, power consumption, some ram tested" option. Could this been the problem? Because I see others using "small ftts" and "blend" option. BTW, JJ from ASUS says that Prime 95 could damage the cpu, do you think this might be true?

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    Re: i7-3820 and ASUS P9X79 4.6GHz - Prime 95 Fails!

    Why do we actually need to over volt the CPU in order to get it stable? I mean, I think mine is around 1.38 VCore now and should I slowly increase it to get it stable? Another thing is that I want my OC to be something like this: When I want to render or play games, I want it to boost like 4.2GHz, when I am not doing anything, I want it to rest. How can I adjust this while also overclocking the CPU? Is there a place in the bios, especially in P9X79, that operates the CPU at these settings?

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    Re: i7-3820 and ASUS P9X79 4.6GHz - Prime 95 Fails!

    Unless disabled, your CPU will downclock into a slow idle speed when it's not being taxed, and will reduce the voltage for these modes as well.

    The faster you go the quicker you need the transistors in the CPU to respond. Higher voltage helps the transistors respond quicker. If the voltage isn't high enough for the requested speed then you get instability.

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    Re: i7-3820 and ASUS P9X79 4.6GHz - Prime 95 Fails!

    I am new to overclocking and I don't want to do something I don't know and damage the CPU. What I am going to do now is CLEAR the CMOS and just start from turning the multiplier to x43. Is this a good idea? Should I tweak something else?

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    Re: i7-3820 and ASUS P9X79 4.6GHz - Prime 95 Fails!

    What are you overclocking for, exactly?

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    Re: i7-3820 and ASUS P9X79 4.6GHz - Prime 95 Fails!

    Nothing special. I just want to push that sweet-spot like everybody else does and at least have 4GHZ. I do a lot of rendering and I think it would help me out.

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    Re: i7-3820 and ASUS P9X79 4.6GHz - Prime 95 Fails!

    Quote Originally Posted by Samwood View Post
    Are you monitoring what temps you are getting when running stress tests?
    If not use this: http://www.techpowerup.com/realtemp/
    Your 3820 is rated to run at 66.8*C, so as long as your temps are below this try increasing the voltage a tiny bit at a time until you get a stable OC. You might need to reduce the clock-speed if it begins to get too hot with the voltage increases.
    Tcase is rated at 66.8, but this is not measured by realtemp. Realtemp can estimate Tjunction, which is more likely to be rated around 105C.

    Quote Originally Posted by diamondmines View Post
    Nothing special. I just want to push that sweet-spot like everybody else does and at least have 4GHZ. I do a lot of rendering and I think it would help me out.
    4ghz is only a 200mhz boost from the current maximum. Set your motherboard to normal values, enable the option that allows all cores to turbo up to maximum (see motherboard manual) and then just increase the base clock to 104mhz. - I haven't looked up how to overclock your CPU so maybe better to check out a guide
    Last edited by kalniel; 24-12-2012 at 01:53 PM.

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    Re: i7-3820 and ASUS P9X79 4.6GHz - Prime 95 Fails!

    Thank you but I am scared now. I was using the Real Temp in windows while I was running prime 95, and I got max around 65C. Does this equal to 105C on the CPU in real temp? If it has, did I damage the cpu in any way? Please explain this a little bit more. I am scared now. I don't want to ruin the cpu now.

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    Re: i7-3820 and ASUS P9X79 4.6GHz - Prime 95 Fails!

    No. If you maxed around 65C then you still have 40C headroom before hitting TjunctionMAX, assuming TjunctionMAX is 105.

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    Re: i7-3820 and ASUS P9X79 4.6GHz - Prime 95 Fails!

    In real temp, my distance to TJ max is as follows for the four cores:

    72C, 74, 74 and 77.

    Is this a problem? I think as the normal CPU temp goes down, TJ max goes up. What is TJ max for and what does it actually measure?

    Thanks

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    Re: i7-3820 and ASUS P9X79 4.6GHz - Prime 95 Fails!

    Should I do ANY of the following for example? *Disable/enable/increase/decrease

    1. Disable SPEEDSTEM (EIST)
    2. C1E Support
    3. Decrease memory ratio (I have 4 sticks of 8x4 = 32GB of 1600MHz CL9 ram
    4. QPI ratio
    5. Load-Line Calibration
    6. CPU VTT (having 4 sticks, I might need to increase a little voltage?)

    Thanks.

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    Re: i7-3820 and ASUS P9X79 4.6GHz - Prime 95 Fails!

    Thank you so much for your help guys. I've got 4.2GHz stable I think. I dialled the clock to 105MHz and ratio to 40x. Now I have 4.2GHz stable. 10 minutes of prime 95 + plus sony vegas rendering, no crash, no blue screens.

    Thank you....)))

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    Re: i7-3820 and ASUS P9X79 4.6GHz - Prime 95 Fails!

    Quote Originally Posted by diamondmines View Post
    In real temp, my distance to TJ max is as follows for the four cores:

    72C, 74, 74 and 77.

    Is this a problem? I think as the normal CPU temp goes down, TJ max goes up. What is TJ max for and what does it actually measure?

    Thanks
    The clue is in the name: 'distance to' means how much room you've got before hitting TJ max. TjunctionMAX is the maximum allowed temperature inside the chip. As your CPU temperature goes down, you have a bigger distance to the maximum temperature allowed, so the distance to TJ max measure increases.

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    Re: i7-3820 and ASUS P9X79 4.6GHz - Prime 95 Fails!

    So apparently, it does look stable. No problems for 2 hours torture test. But when I restart, the monitor doesn't pick up the signal. I shut down, and then it comes back on. Any suggestions.

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