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Thread: ED45-UD3p with 8400 Dual Core overclock help! :)




  1. #241
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    Default Re: ED45-UD3p with 8400 Dual Core overclock help! :)

    Quote Originally Posted by profJim View Post
    MCH Core looks like it has room to grow, as does VTT.

    As you o/c higher you're putting additional stress and demands on all of the sub-systems, not just your cpu.
    Upping the Cpu Vcore alone probably isn't enough. As an example, it's possible but probably not likely that you might need slightly looser memory timings.
    It might be time for more Reference volt tweaking or clock skews.
    PSU problem?
    Anyone have a big bottle of SWAG?
    LOL
    Sounds like a plan. I'll try to work MCH Core and VTT.


    Quote Originally Posted by profJim View Post
    Let's think outside the box:
    1) Turn off your system and let it cool for 10 - 15 minutes.
    2) When was the last time your thoroughly cleaned out the interior of the case. I always re-seat all cables and plug-in hardware when I clean mine.
    3) Maybe something isn't secure when you installed your new cpu cooler.
    4) Tried prayer?

    Last time was last week. Fully vacuumed, fan filter clean, cables managed and out of the way of airflow. I felt pretty confident with the cooler installation - really took my time with it. Might be time for prayer lol.

    Quote Originally Posted by Deafty View Post
    If we're talking temps,. I notice your GPU is at 51. I'm pretty sure you're not really using at the moment so I will take that reading as idle.

    I have mine (although vacum cleaner loud) down from 71 to 32 just with stock fan cooler it came with turned up to max.
    As a result I dropped my System temp,.along with CPU (ambient) temps down substantially.

    If you could do something similar,. I see damn near 4GHz on air!
    That's a good suggestion - I'll see if I can crank it up some.


    I think that first I'm going to work with the settings, and see if I can get it running with the VCore up to 1.41875 (my current temp limit).

    Last VCore required increment (from 484 to 489 FSB) was 0.03125. Now I'm moving up a similar increment (to 495 FSB). I'm guessing we can assume that necessary VCore voltage would be AT LEAST an equal increase which would put us at a minimum of 1.40625.

  2. #242
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    profJim is online now Chief Munchkin + moderator
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    Default Re: ED45-UD3p with 8400 Dual Core overclock help! :)

    It's a pretty safe bet that at this point, as you go with higher FSB, required cpu vcore requirements will continue to rise at an accelerating rate.
    Next step water cooling?

  3. #243
    Chike is offline Senior Member
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    Default Re: ED45-UD3p with 8400 Dual Core overclock help! :)

    I suggest running Prime95 making sure the 489x9 is stable, It's a great OC with great temps, honestly I never though about going that far, more like 4.15-4.25GHz.
    Remember the original goal is to have a faster system until Ivy Bridge is out, we don't want to fry anything.

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    Default Re: ED45-UD3p with 8400 Dual Core overclock help! :)

    I figured I would try some brute force with the MCH Core and VTT, thinking that if I could get it to work this way at 1.41875 VCore, then it may suggest that some more fine tuning might make it possible.

    Here's my test log since last stable build:

    Previous build:
    484 x 9 x 978 @ VCore 1.37500, passed IBT. No Prime95 testing.

    Testing build:
    495 x 9 x 990



    VCore 1.37500
    IBT: Fail

    VCore: 1.38125
    IBT: Fail

    VCore: 1.38750
    IBT: Fail

    VCore: 1.339375
    IBT: Fail

    VCore: 1.40000
    IBT: Fail

    VCore: 1.41250
    IBT: Fail

    VCore: 1.41875
    IBT: Fail

    (Temps maxed at 80C).


    With VCore @ 1.41875, MCH Core 1.240....


    VTT 1.240:
    IBT: Fail

    VTT 1.260:
    IBT: Fail

    Then, keeping VTT at 1.260, I changed MCH Core

    MCH Core 1.260:
    IBT: Fail

    MCH Core 1.280:
    IBT: Fail

    MCH Core 1.300:
    IBT: Fail

    MCH Core 1.340:
    IBT: Fail

    MCH Core 1.360:
    IBT: Fail

    With MCH at 1.360, I tried up'ing VTT more:

    VTT 1.280:
    IBT: Fail

    VVT 1.300:
    IBT: Fail

    VVT 1.340:
    IBT: Fail

    VVT 1.360:
    IBT: Fail


    Quote Originally Posted by profJim View Post
    It's a pretty safe bet that at this point, as you go with higher FSB, required cpu vcore requirements will continue to rise at an accelerating rate.
    Next step water cooling?
    At this point (as the professor points out), and after this testing, it seems pretty evident that going higher than 4.400 Ghz is going into the range where performance increases are requiring a significantly exponential increase in resources.

    4.400 Ghz seems to be the sweet spot if I can verify its stability, for now at least.

    Water cooling is very tempting, if not only just for the fun of designing and setting it up. I've read a few beginners guides already and I'm evaluating whether or not I want to spend the money. At the very least, I'll get two nice new fans to put on the cooler and see how much that can bring it down. Could always reuse them as case fans if I end up going with water down the road.

    Quote Originally Posted by Chike View Post
    I suggest running Prime95 making sure the 489x9 is stable, It's a great OC with great temps, honestly I never though about going that far, more like 4.15-4.25GHz.
    Remember the original goal is to have a faster system until Ivy Bridge is out, we don't want to fry anything.
    I'll run 8 hour Prime95 Blend Test segments through the night and during work tomorrow. Should be a good 16+ hours of testing. You make a very good point -- 4.4 Ghz is far above what I expected to get, going into this, and it certainly does seem to have modest temps and voltage consumption.
    Last edited by jake8078; 09-26-2011 at 09:36 AM.

  5. #245
    Chike is offline Senior Member
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    Default Re: ED45-UD3p with 8400 Dual Core overclock help! :)

    With some luck it will pass Prime95.... with some more luck it will fail giving us the chance to find finer stable tweaks that may help the higher frequency.
    If it fail, write down the failing FFT size. If it BSODs the last executed FFT is in Prime95 log(results.txt or something).

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    Default Re: ED45-UD3p with 8400 Dual Core overclock help! :)

    Quote Originally Posted by Chike View Post
    With some luck it will pass Prime95.... with some more luck it will fail giving us the chance to find finer stable tweaks that may help the higher frequency.
    If it fail, write down the failing FFT size. If it BSODs the last executed FFT is in Prime95 log(results.txt or something).
    Haha now we're talkin. Specifically:

    A failure occurred during a Prime 95 blend test (8 minute intervals) during Test 10:
    6500 Lucas-Lehmer iterations of M12451839 using Core2 type-3 FFT length 720K, Pass 1=320, Pass 2=2304

    Worker #1 recorded:
    FATAL ERROR: Rounding was 0.5, expected less than 0.4
    Hardware failure detected, consult stress.txt file.

    while Worker #2 recorded:
    FATAL ERROR: Rounding was 0.4985351563, expected less than 0.4
    Hardware failure detected, consult stress.txt file.

    EDIT: Clarification: This instance did not involve a BSOD. Just a test failure in Prime95

  7. #247
    Chike is offline Senior Member
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    Default Re: ED45-UD3p with 8400 Dual Core overclock help! :)

    Try to run the same test again with min/max FFT 720k see if we can reproduce this quick.
    I didn't see if you answered, do you have ET6 installed?

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    Default Re: ED45-UD3p with 8400 Dual Core overclock help! :)

    Quote Originally Posted by Chike View Post
    I didn't see if you answered, do you have ET6 installed?
    Yep, sure do. Will run test right now.

  9. #249
    Chike is offline Senior Member
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    Default Re: ED45-UD3p with 8400 Dual Core overclock help! :)

    If no luck repeating it, run Prime95 blend with default 15 minutes per test since it's going to be a long run, maybe we will get lucky with another FFT size, it seems tha prime number tested has also something to do with it.
    If you do manage to repeat a failure, try tweaking the refernces with ET6 to save all the reboots.

  10. #250
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    Default Re: ED45-UD3p with 8400 Dual Core overclock help! :)

    Was away from computer for a bit. Test was indeed repeatable

    <img src = http://img29.imageshack.us/img29/2204/prime95.png>

    Tomorrow I will try tweaking the references with ET6 and repeating the same test, and see if I can make some progress.

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