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Thread: overclocking the Q9550 with low voltage




  1. #1
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    Default overclocking the Q9550 with low voltage

    I just recently bought a slightly used EP45-UD3P and I love it. Best board I have ever owned.


    So...

    I'm a little different in that I want a decent overclock with a low voltage (without doing too much tweaking). I started with 3200Mhz at 1.15V and its been running fine for a week. I was thinking of dropping it by 0.025V and I think I should be able to get it to at least 1.10V

    Does that sound reasonable? How much lower could it go? To get it lower would I have to adjust other settings like when others try to get maximum overclocks?

    and how does EIST and C1E work with overclocking? I have them both turned off right now I believe but would like it to drop multipliers when less active. Would I have to set it to just one voltage or could I pick a peak voltage and it will go even lower when the multiplier drop (that would be nice). Should they both be on or just one?

    If I can get the multiplier switching working with very low voltages I might try clocking it a bit higher (3400 or so)...
    EP45-UD3P rev 1.6 BIOS FE || Q9550 E0 at 3200MHz (8x400) 1.15V || 2x2GB Corsair XMS2 DDR2800

  2. #2
    profJim's Avatar
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    Default Re: overclocking the Q9550 with low voltage

    Have you run any stress tests using Intel BurnTest (IBT), LinX, Prime95, or OCCT? If yes, which tests and for how long?
    We can best help you if you will post your current bios settings using this EP45 bios template.
    Please follow steps 2, 3, and 4 in this post to provide additional information.
    We can best help you when you provide full information.

    For now, enable C1E and EIST and see if your system is stable with your current settings.
    Running 10 loops of IBT or LinX, followed by several hours of Prime95 Blend test will quickly tell us if your system is stable.
    Prime95 should run for at least 6 - 12 hours ideally, but a 3 - 4 hour test will give a good indication that your system is possibly stable.
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  3. #3
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    Default Re: overclocking the Q9550 with low voltage

    On my board C1E only works when Vcore is set to auto and FSB is stock or Vcore is set to normal and FSB can be defined to any value. If I use some other settiings there is no error messages but C-states don't really work because Vcore always remains the same. Same happens if you enable only EIST.

    My system can go up to 425 * 8.5 (3.61 GHz) with settings like this:
    Code:
    ******Motherboard Voltage Control******
    
    Load-Line Calibration..........................[ Disable ]
    CPU Vcore [ 1.225].............................[ Normal  ]
    CPU Termination [ 1.20 ].......................[ Normal  ]
    CPU PLL [ 1.50 ]...............................[ Normal  ]
    CPU Reference [ 0.760 ]........................[ Normal  ]
    
    MCH Core [ 1.100 ].......................[ 1.20 ]
    MCH Reference [ 0.760 ]..................[Normal]
    MCH/DRAM Reference [ 0.900 ].............[Normal]
    ICH I/O [ 1.500 ]........................[Normal]
    ICH Core [ 1.100 ].......................[Normal]
    
    DRAM Voltage [ 1.800 ]...................[Normal]
    DRAM Termination [ 0.900 ]...............[Normal]
    Channel A Ref [ 0.900 ]..................[Normal]
    Channel B Ref [ 0.900 ]..................[Normal]
    
    Advanced Settings
    Limit CPUID Max. to 3 ...................[ Disable ]
    No-Execute Memory Protect ...............[ Enabled ]
    CPU Enhanced Halt (C1E) .................[ Enabled ]
    C2/C2E State Support ....................[ Enabled ]
    x C4/C4E State Support ..................[ Enabled ]
    CPU Thermal Monitor 2 (TM2) .............[ Enabled ]
    CPU EIST Function .......................[ Enabled ]
    Virtualization Technology ...............[ Enabled ]
    If I also enable LLC then I can go to 460 * 8.5 with Vcore set to normal but enabling LLC pushes core temps about 10 degrees higher.
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  4. #4
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    Default Re: overclocking the Q9550 with low voltage

    @mm67
    Please post an EasyTune6 screen-shot using: TUNER tab --> ADVANCE tab --> VOLTAGE tab (only the Voltage tab is needed)
    and cpu-z -> CPU tab

    This will confirm what voltages are applied using the NORMAL option.
    Q9650 @ 4.10GHz [9x456MHz]
    P35-DS4 [rev: 2.0] ~ Bios: F14
    4x2GB OCZ Reaper PC2-8500 1094MHz @5-5-5-15
    MSI N460GTX Hawk Talon Attack (1GB) video card <---- SLI ---->
    Seasonic SS-660XP2 80 Plus Platinum psu (660w)
    WD Caviar Black WD6401AALS 640GB (data)
    Samsung 840 Pro 256GB SSD (boot)
    SLI @ 16/4 works when running HyperSLI
    Cooler Master 120XL Seidon push/pull AIO cpu water cooling
    Cooler Master HAF XB computer case (RC-902XB-KKN1)
    Asus VH242H 24" monitor [1920x1080]
    MSI N460GTX Hawk (1GB) video card
    Logitech Z-5500 Digital 5.1 Speakers
    win7 x64 sp1 Home Premium
    HT|Omega Claro plus+ sound card
    CyberPower CP1500PFCLCD UPS
    E6300 (R0) @ 3.504GHz [8x438MHz] ~~ P35-DS3L [rev: 1.0] ~ Bios: F9 ~~ 4x2GB Kingston HyperX T1 PC2-8500, 876MHz @4-4-4-10
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    win7 x64 sp1 Home Premium ~~ CyberPower CP1500PFCLCD U.P.S
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  5. #5
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    Default Re: overclocking the Q9550 with low voltage

    you have done well.

    c2e c4e enabled will result idle 400*6 running at only 0.85v in idle, this is probably bad and will damage software. altough it works fine on my system. 7 watts less in idle.
    c1e eist enabled will result 400*6 1.05v in idle, this may be ok, 2 watts less in idle

    but as you said all this only happends if Cpu vcore='normal'

    in my system the 6 multiplier consumes 0.5W less compared to 8 multiplier when idle, i wouldn't worry if running a 8 in idle. disable them all.

  6. #6
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    Default Re: overclocking the Q9550 with low voltage

    This a screenshot after a quick 10 minutes OCCT Linpack run (ambient temp about 23):
    Attachment 2640
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  7. #7
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    Default Re: overclocking the Q9550 with low voltage

    Quote Originally Posted by yuu View Post
    you have done well.

    c2e c4e enabled will result idle 400*6 running at only 0.85v in idle, this is probably bad and will damage software. altough it works fine on my system. 7 watts less in idle.
    c1e eist enabled will result 400*6 1.05v in idle, this may be ok, 2 watts less in idle

    but as you said all this only happends if Cpu vcore='normal'

    in my system the 6 multiplier consumes 0.5W less compared to 8 multiplier when idle, i wouldn't worry if running a 8 in idle. disable them all.
    C4 is actually pretty useless for me anyway, cpu hardly uses that anyway. My C-state usage looks like this:
    Attachment 2641

    I actually know that this happens because of my bluetooth and Wlan adapters, if I remove those C4 usage goes to almost 100 % while idling
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  8. #8
    Acebmxer's Avatar
    Acebmxer is offline Gigabyte Elite
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    Default Re: overclocking the Q9550 with low voltage

    Quote Originally Posted by mm67 View Post
    C4 is actually pretty useless for me anyway, cpu hardly uses that anyway. My C-state usage looks like this:
    Attachment 2641

    I actually know that this happens because of my bluetooth and Wlan adapters, if I remove those C4 usage goes to almost 100 % while idling
    where did you get that program?
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  9. #9
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    Default Re: overclocking the Q9550 with low voltage

    Quote Originally Posted by Acebmxer View Post
    where did you get that program?
    That's the standard performance monitor that comes with Windows
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  10. #10
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    Default Re: overclocking the Q9550 with low voltage

    My E8400 can do exactly 400*8 3200 at 1.1V, but with the newer version of intelburntest 2.5 probably really stable is 20Mhz less now. You can expect to be enough for E0 revision, but don't let it be 10-20Mhz apart from failing the tests. I keep mine at 0.025V more than it really needs it doesn't do much difference.

    There are no other settings that you can tweak to improove oc. it is all your luck having a good CPU.

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