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Thread: UD3P and Q9550= SWEET!




  1. #21
    Lsdmeasap's Avatar
    Lsdmeasap is offline GIGABYTE Guru
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    Default Re: UD3P and Q9550= SWEET!

    Ya 1.2v for Vcore ot Vtt may not be enough. Here is some additional reading on Ref Voltages I have been working on for my Board review/Guide >>>

    For me, All the references in ET6 are wrong or always show the same defaults. Why is this?
    That is ONLY because ET Shows the .xx % of Vtt of what you set in the BIOS. The Default Value of MCH Ref is .63% of Vtt at stock of 1.20V, which is .756 (.76)

    The Ref Settings in the BIOS are .xx % values of/X Vtt so this tends to throw off many users when they set something and then compare to EasyTune. So you need to keep the % amounts in mind when changing these Ref voltages, and it is easiest to do it at stock Vtt and then raise your Vtt back up to where you want to run it. If you Make any deviation from the stock % for MCH Ref of .63% the value will be reflected in ET

    Here is Four Common examples of this, all using MCH Ref, and 1.30 Vtt (Termination). All of these but the last WILL Change what you see for MCH Ref in EasyTune as well. This way I hope you can see how this works, and then maybe better find your way to tuning your Ref voltages

    *** Examples Below using 1.3 Vtt ***

    (MCH Ref .68% AKA .68 in ET)
    For example if you set 1.3 Vtt and .884 MCH Ref, ET would show .68 MCH Ref as .884 would be .68% of Vtt.

    (MCH Ref .70% AKA .70 in ET)
    Another example if you set 1.3 Vtt and .91 MCH Ref, ET would show .70 MCH Ref as .91 would be .70% of Vtt

    (MCH Ref .72% AKA .72 in ET)
    Another example if you set 1.3 Vtt and .936 MCH Ref, ET would show .72 MCH Ref as .936 would be .72% of Vtt

    STOCK MCH Ref VALUES at .63% (To Help show how ET Seems to always show .76 for users)

    First Example shows stock values for Ref used, .63%. That would be MCH Ref manually set but Value unchanged (.76) and then Vtt Raised to 1.3, or manually set to .819 and Vtt Manually set to 1.3..........

    (Stock MCH Ref W/ 1.3 Vtt / .76 in ET)
    If you set 1.3 Vtt and .819 MCH Ref ET would show .76 MCH Ref as .819 would be .63% of Vtt

    This Example shows Stock Vtt and Stock MCH Ref used.........

    (Stock MCH Ref W/1.20 Vtt or .76 in ET)
    If you set 1.2 Vtt and .756 MCH Ref ET would show .76 MCH Ref as .756 would be .63% of Vtt.


    That is just ONE example, and how to manipulate it, of the Many Ref Voltages in the BIOS Vs. what you see in Easytune. Here are all the values affected by other Values in the BIOS and their respective Percentages.

    CPU Termination (Vtt) Automatically changes the following if manually set >>>

    CPU Reference Voltage (.63% of Default Vtt/1.20) .76 ET
    CPU Reference2 Voltage (.67% of Default Vtt/1.20) .80 ET
    MCH Reference Voltage (.63% of Default Vtt/1.20) .76 ET

    DRAM Voltage Automatically changes the following if manually set >>>

    MCH/DRAM Reference Voltage (.50% of Default Dram Voltage)
    DRAM Termination Voltage (.50% of Default Dram Voltage)
    Channel A Reference Voltage (.50% of Default Dram Voltage)
    Channel B Reference Voltage (.50% of Default Dram Voltage)

    If you want a higher or lower than stock % / Value for any of the above settings you will find it easier to set the Dram Voltage or Vtt back to stock (Or above or below to find and be able to choose alternate % Values), then adjust desired setting to the % / Value you wish to use.

    Then once you have selected a % range you want to use for said setting then go back and raise your Vtt or Dram Voltage back to what you choose to use and the corresponding settings will self adjust and still be set to the .xx % amount that you set them to.

  2. #22
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    Default Re: UD3P and Q9550= SWEET!

    Flyfisher - " The key seemed to be keeping the CPU and MCH reference voltages at about 67%." I agree. This is how I was first able to hit 3.8 stable... when I realized/started setting CPU Ref and MCH Ref both in relation to CPU Vtt . Also DRAM V dictates DRAM Vtt, MCH/DRAM Ref, CH A Ref, and CH B Ref (DRAM V x .5)
    Q9550 C1 step
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  3. #23
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    Default Re: UD3P and Q9550= SWEET!

    Flyfisher: Using your template settings I managed 45 minutes of Prime95 Blend,which is much better than I managed before (2-3 minutes).

    Maybe a bit more Vcore?
    Q9550 EO 4.0ghz 475x8.5 1.325v LLC on
    Gigabyte EP45-UD3P f9c OCZ Vendetta2 w/bolt kit
    4x2gb OCZ PC2 8500 5-6-6-18 1.9v @950mhz
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  4. #24
    flyfisher is offline Member
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    Default Re: UD3P and Q9550= SWEET!

    Prospector,

    You probably do need a bit more Vcore, especially if you do not have LLC enabled. Go into your BIOS and look at the first value in CPU Vcore. This is the vid for your CPU, what the motherboard sets as default Vcore for your particular CPU, and generally the lower the better. Mine is 1.2125V.

    I had Vcore set to 1.3125V with LLC disabled. This gave me 1.264V in Windows with Everest and CPU-Z. Vcore dropped to 1.216V under Prime95 load and actually went as low as 1.200 when running Linpack stress test. I was surprised that it passed. I enabled LLC and set Vcore to 1.25. In Windows this gives 1.216V at idle or load. If I knew where to measure the Vcore with a DMM I'd check it to make sure exactly what it is. At any rate it is amazing to me to get a quad to 4GHz with what is essentially stock voltage.

    At this low voltage I have no qualms about havings LLC enabled. I have heard arguments both ways on LLC but ultimately it's what would you feel comfortable with.

    Edit: You may need more Vdimm too. At 475 FSB your RAM is going to be at DDR2-950. That is overclocked pretty much from 800 so make sure you RAM can do it. Some DDR2-800 kits overclock well, some don't do diddly.
    Last edited by flyfisher; 01-11-2009 at 03:47 AM.

  5. #25
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    Default Re: UD3P and Q9550= SWEET!

    @Flyfisher Good info for sure I'll be testing again shortly.
    I used to have a hard time OCing the mem sticks till I found out that tRFc 54 really lets them run and at low volts too.

    Edit: at default the bios shows 1.18 vcore
    Last edited by Prospector; 01-11-2009 at 04:10 AM.
    Q9550 EO 4.0ghz 475x8.5 1.325v LLC on
    Gigabyte EP45-UD3P f9c OCZ Vendetta2 w/bolt kit
    4x2gb OCZ PC2 8500 5-6-6-18 1.9v @950mhz
    Asus 4870 512 Scythe Musashi
    Ocz Gamextream 600w
    2x300gb Velociraptors RAID0
    CoolerMaster Stacker 830
    Dynex 32" HDTV on HDMI
    Vista Premium 64-bit

  6. #26
    flyfisher is offline Member
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    Default Re: UD3P and Q9550= SWEET!

    @Prospector, do you have speedstep enabled? Each chip has two vid values, one when speedstep lowers the voltage and mulitplier, and one when the chip is under load. To find out for sure download RealTemp http://www.fileden.com/files/2008/3/3/1794507/RealTempBeta.zip

    Unzip and run the program. Click on the "settings button", and in the settings window, look at the "other settings" section. Under the entry "CPU vid" there will be a min and max value. Mine are 1.075 and 1.2125. What are yours? If the max is 1.18 that is great, if it's the min then it is going to take a bit more volts to get to 4 GHz.

  7. #27
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    Default Re: UD3P and Q9550= SWEET!

    1.075 - 2.0 from Realtemp.

    I was doing well P95 2 hrs but now failing several cores after af ew minutes. 1.268vcore

    Memtest86 v2.11 passes fine

    Perhaps more MCH voltage?

    Speedstep disabled
    Q9550 EO 4.0ghz 475x8.5 1.325v LLC on
    Gigabyte EP45-UD3P f9c OCZ Vendetta2 w/bolt kit
    4x2gb OCZ PC2 8500 5-6-6-18 1.9v @950mhz
    Asus 4870 512 Scythe Musashi
    Ocz Gamextream 600w
    2x300gb Velociraptors RAID0
    CoolerMaster Stacker 830
    Dynex 32" HDTV on HDMI
    Vista Premium 64-bit

  8. #28
    flyfisher is offline Member
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    Default Re: UD3P and Q9550= SWEET!

    Need to know a couple of things, are you trying to get stable at 475x8.5 using my settings, and do you have LLC disabled or enabled? What is your Vcore set at now? What does CPU-Z (or EasyTune if you have it installed) say your Vcore is under load?

    Edit: vid of 1.20 is very good.
    Last edited by flyfisher; 01-11-2009 at 09:53 AM.

  9. #29
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    Default Re: UD3P and Q9550= SWEET!

    Yes trying to get stable per your settings,LLC enabled vcore in bios is currently 1.3375 CPU-Z shows 1.296 under load.
    Q9550 EO 4.0ghz 475x8.5 1.325v LLC on
    Gigabyte EP45-UD3P f9c OCZ Vendetta2 w/bolt kit
    4x2gb OCZ PC2 8500 5-6-6-18 1.9v @950mhz
    Asus 4870 512 Scythe Musashi
    Ocz Gamextream 600w
    2x300gb Velociraptors RAID0
    CoolerMaster Stacker 830
    Dynex 32" HDTV on HDMI
    Vista Premium 64-bit

  10. #30
    flyfisher is offline Member
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    Default Re: UD3P and Q9550= SWEET!

    I have had Memtest pass and then have memory problems in Windows. Lower your multiplier to 6x to take the CPU out of the equation and run Memtest for windows MemTest for Windows Download Page. Run four instances so that all four cores are used. Assign less than a quarter of your total memory to each instance, leaving enough for the OS to run. Let it run several hours or overnight if you can. The free version will stop running at an error but that is all we are concerned about.

    I have found that just one error here will cause Prime to fail. If it does fail you wil have to revisit your memory settings, probably increasing Vdimm and MCH voltage. But only change one thing at a time and test so you know which change you made solved the problem.

    Obviously if these tests pass with a 6 multi then memory is not an issue. You will have to experiment with Vcore, CPU termination and CPU reference.

    Afterthought: Are you still trying to run all 8GB of RAM or just 4? 8GB is going to take some MCH tweaking as it puts a lot of stress on the memory controller.

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