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Thread: Fine-tuning/settings for my mild 3.4 i7920 oc?

  1. #1
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    H-508 is offline

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    Default Fine-tuning/settings for my mild 3.4 i7920 oc?

    Hey, I could use some help to fine-tune or adjust my bios settings for my mild 3.4GHz overclock or where I should start looking to lower the voltages. My goal was for a 3.2-3.6 overclock as I didn't want to get crazy because I need to make sure this computer lasts for 5 years and it's on 24/7 just about and I'd rather not take a single chance on longevity by going higher.

    Most of the settings and guides are all for 4-4.2GHz so naturally there are a lot more things you need to do to be stable at those speeds. Since I'm only at 3.4, I didn't know if some of the items that typically get disabled in these guides could actually be worthwhile at my lower speeds.

    I've attached screenshots below of the worthwhile bios shots that detail what I changed and cpu-z. Basically, everything was at Auto or Enabled before I started in the bios.

    For the DRAM Frequency/UCLK Freq/QPI Link Data Rate - I just used the nearest settings that the nehalem overclock calculator gave which were very close to what options the bios gave me from Mem Multi: 8, UnCore Multi: 16, QPI Multi: 18, CPU Multi: 20, BCLK: 170

    For the voltages, that was just a first time guess using the upper end of what I thought I would need.

    Before I started the OC, the max temps running Prime95 blend were 59C.
    At the current OC, it's stable at 12 hours Prime95 blend with a max temp of 70C for the hottest core (70-69-67-65 in coretemp or 70-70-69-68 in Everest Ultimate). This OC was my first attempt ever and the first time with these settings.


    I'm sure I can go higher on the bclk, but like I said, I'd rather just optimize where I'm at now for my own piece of mind. Basically, I'd like to know if you recommend enabling some of the items I disabled, or, what voltages I should look at to start lowering and in what order to run even cooler.

    Thanks for the help

    CPU Ratio: 20
    BCLK: 170
    DRAM Freq: DDR3-1363 (Mem Multi: 8)
    UCLK: 2726 (Uncore multi: 16)
    QPI: 6135 (QPI Multi: 18)
    Memory: 7-7-7-24 @1.6v
    CPU volt: 1.25
    QPI volt: 1.3






    Last edited by H-508; 20-12-2009 at 09:55. Reason: added info

  2. #2
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    hey there welcome to PureOC!
    im not an expert at overclocking but ive learnt alot so heres my two bits worth. ive always kept the vcore and qpivtt voltages close together and the vcore has always been higher. ive also concluded that if the computer will run Prime for one hour then its quite stable. never saw a need to run it for 8 or 12 hours. also ive found that there is a fairly wide range for the vcore where itll work, all else being equal. id say like one or two notches either way. so just try to lower it and try the Prime. if it works then try lowering the qpivtt. keep doing this trial and error until you find the lowest values.
    one more thing about that heat. i wouldnt worry about your computer wearing out over time as long as your temps are under 75.
    well thats all i can think of. with your moderate overclock, having everything on auto is good and should work good. and that load line calibration is really good too.
    ok gl

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    Welcome to PUREOC!

    You only do mild OC and if I were you I would leave everything on Auto and leave everything under Advanced menu where they are. Now just change the Bclk to 160, this will give you 3.2Ghz and when Turbo kick in then you will have 3.36Ghz.

    With this setting you will have lower temps because you don't run it at full speed all the time and you probably run the Vcore at stock voltage. You can use Everest or CPU-Z to monitor the Vcore, write it down. Now go back into the bios and manually adjust this voltage a notch or two lower, test it to see if it is stable or not. Basicly, you try to find the lowest voltage that give you the stability because mobo tend to use higher volt.

    BTW, P6T board is pretty good with Auto settings.

  4. #4
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    I'm surprised you'd recommend going back to auto settings and just setting the BCLK. I'd figure you'd want more control, even if it is a mild oc. I've heard this board's auto settings are good, but I figured manual is better in every case if you know what you're doing (or have internet messageboard forum help).

    I'm about an hour in with Prime95 blend with changing my:
    CPU volt: from 1.25 to 1.2
    QPI volt: from 1.3 to 1.25

    and leaving everything else the same and my temps are hitting a max of 64C - so a 6C drop from the previous. So far so good I think...



    My memory is rated at 7-7-7-24 at 1600MHz at 1.65 volts. Everest shows it can be at 7-7-7-16 at 1066MHz at 1.5 volts. I currently have it at 7-7-7-24 at 1363MHz at 1.6 volts. I wonder if I should drop the last number or drop the volts for any performance/heat gains...
    Last edited by H-508; 20-12-2009 at 09:54.

  5. #5
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    Quote Originally Posted by H-508 View Post
    I'm surprised you'd recommend going back to auto settings and just setting the BCLK. I'd figure you'd want more control, even if it is a mild oc.

    If you totally want manually control the board then you can fine tune the voltage but now try to put those voltage setting on Auto to see if there are any different with your voltage. My prediction is within 0.375v

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