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Thread: Question about e8400 voltage and stability




  1. #1
    Join Date
    Mar 2009
    Posts
    22

    Default Question about e8400 voltage and stability

    I have my e8400 (E0) overclocked to 4.0Ghz, stable, at only 1.2625 vcore (in BIOS). Now, when I try to go to 4.2Ghz I just can't get it close to stable and I've tried as high as 1.425 vcore (in BIOS). So, is this typical of e8400 processors, to top out at one OC on very acceptable voltages but then require so much more voltage to get to the next level?

    I will post my 4.2Ghz settings here if anybody could take a look and see if I've got anything wrong or anything I could try. My system specs are in my sig. I tested my RAM at 960mhz, so I don't think it's the problem. My 4.0Ghz OC used 1.2625 vcore, 1.2 vtt, 1.5 pll, 1.3 MCH. Here are the unstable 4.2 settings:


    MB Intelligent Tweaker(M.I.T.)
    Robust Graphics Booster ...............: Auto
    CPU Clock Ratio ..........................: 9x
    Fine CPU Clock Ratio.....................:. +0.0
    CPU Frequency ...........................: 4.2ghz


    Clock Chip Control
    Standard Clock Control
    CPU Host Clock Control..................: [Enabled]
    CPU Host Frequency (Mhz) ............: 467
    PCI Express Frequency (Mhz) .........: 101


    C.I.A.2 .................................:[Disabled]


    Advanced Clock Control [Press Enter]
    CPU Clock Drive...........................: 800
    PCI Express Clock Drive.................: 900
    CPU Clock Skew (ps)....................: 0
    MCH Clock Skew (ps)...................: 0


    DRAM Performance Control
    Performance Enhance...................: [STANDARD]
    Extreme Memory Profile (X.M.P.).....: Disabled
    (G)MCH Frequency Latch...............: 400
    System Memory Multiplier ..............: 2.0D
    Memory Frequency (Mhz) ..............: 934 mhz
    DRAM Timing Selectable ................: [Manual]


    Standard Timing Control
    CAS Latency Time........................ 5
    tRCD ......................................... 5
    tRP'........................................... 5
    tRAS.......................................... 18


    Advanced Timing Control
    tRRD........................................... 3 (auto)
    tWTR.......................................... 3 (auto)
    tWR............................................ 6 (auto)
    tRFC........................................... 60 (manual)
    tRTP........................................... 3 (auto)
    Command Rate (CMD) ....................: 0 (auto)


    Driving Strength Profiles
    Driving Strength ............................ 1066 for both channels


    Channel A
    Static tRead Value.........................: 12 (manual)
    tRD Phase0 Adjustment...................:Auto 0
    tRD Phase1 Adjustment...................:Auto 0
    tRD Phase2 Adjustment .................:Auto 0
    tRD Phase3 Adjustment..................:Auto 0
    Trd2rd(Different Rank)....................:Auto 6
    Twr2wr(Different Rank)...................:Auto 6
    Twr2rd(Different Rank)...................:Auto 5
    Trd2wr(Same/Diff Rank)..................:Auto 8
    Dimm1 Clock Skew Control...............:Auto ps
    Dimm2 Clock Skew Control...............:Auto ps


    Channel B
    Static tRead Value.........................: 12 (manual)
    tRD Phase0 Adjustment...................:Auto 0
    tRD Phase1 Adjustment...................:Auto 0
    tRD Phase2 Adjustment .................:Auto 0
    tRD Phase3 Adjustment..................:Auto 0
    Trd2rd(Different Rank)....................:Auto 6
    Twr2wr(Different Rank)...................:Auto 6
    Twr2rd(Different Rank)...................:Auto 5
    Trd2wr(Same/Diff Rank)..................:Auto 8
    Dimm1 Clock Skew Control...............:Auto ps
    Dimm2 Clock Skew Control...............:Auto ps


    Motherboard Voltage Control
    Voltage Type.………... Manual
    Load Line Calibration......................... [Disabled]
    CPU
    CPU Vcore….……….........................: 1.425 (manual)


    CPU Termination…..... 1.200V*.......: 1.38 (manual)


    CPU PLL…………………....1.500V*.......: 1.59 (manual)


    CPU Referen.…………....0.755V*.......: .76 (auto)




    MCH/ICH
    MCH Core…………….....1.100V...........: 1.4 (manual)
    MCH Reference….…….0.800V...........; .76 (auto)
    MCH/DRAM Ref.…......0.900V...........: .9 (auto)
    ICH I/O……………….....1.500V............: 1.5 (manual)
    ICH Core…………...……1.100V............: 1.1 (manual)


    DRAM
    DRAM Voltage ……....1.800V............: 2.0v (manual)
    DRAM Termination .…0.900V............: 0.9 (auto)
    Channel A Reference 0.900V............: 0.9 (auto)
    Channel B Reference 0.900V............: 0.9 (auto)


    Advanced Settings
    Limit CPUID Max. to 3.....................: [Disabled]
    No-Execute Memory Protect............: [Enabled]
    CPU Enhanced Halt (C1E)................: [Disabled]
    C2/C2E State Support....................: [Disabled]
    x C4/C4E State Support..................: [Disabled]
    CPU Thermal Monitor 2(TM2) ...........: [Enabled]
    CPU EIST Function.........................: [Disabled]
    Virtualization Technology................: [Disabled]


    Integrated Peripherals
    Legacy USB Storage Detect ..............[Disabled]
    **thepieguy**
    CPU : Core2Duo E8400 @ 4.0Ghz, 1.2625v (BIOS)
    Power: CORSAIR CMPSU-400CX
    Mainboard : Gigabyte GA-EP45-UD3R
    CPU Cooler : Xigmatek HDT-S1283
    RAM : OCZ Reaper HPC DDR2 800 4GB (2 x 2GB) OCZ2RPR800C44GK
    Video Card : Sapphire ATI Radeon HD 4830
    Optical Drive : LITE-ON iHAS122-04
    OS : Windows XP SP3 32bit

  2. #2
    kick's Avatar
    kick is offline Senior Member
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    Europe,the wild wild west.
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    Default Re: Question about e8400 voltage and stability

    did you check this?
    http://forums.tweaktown.com/f69/ud3p...65/index3.html

    Might be some info.
    Just as an aside my ram needs 2.2v in bios to run 1000mhz and only 2.08 for 980,I wouldnt bother pushing it except the 3.5 Ghz/500fsb feels better than 3.43/490
    Last edited by kick; 03-26-2009 at 10:15 AM.
    Current Systems:

    Asrock p67 Extreme6.............. Gigabyte EP-45 UD3 ...................... Gigabyte 73 PVM S2
    Intel i5 2500k 4.8ghz................ Intel Q8400 3.8ghz......................... Intel D820 2.8ghz
    Zalman 10x cooler.................... Coolermaster V8............................ HP cooler
    8GB Gskill ripjaw ddr3.............. 4GB Gskill PI ddr2.......................... 4GB samsung ddr2
    60GB ssd/500GB HDD .............. WD 1TB hdd.................................... Seagate 160GB hdd
    GTX 460 1GB x2 SLI ................. Msi 9600GT 512MB(died) ........... Onboard gx
    Win7 64 ,750w psu(ocz)............ Win7 64 ,520w psu,seasonic...... Win XP pro ,400w psu

    HEC 6A34 case . ....................... Jeantec R2 case............................ Packard Bell case

    hoping to upgrade to http://www.thinkgeek.com/stuff/41/habicase.shtml
    http://www.flixya.com/video/140325/Animal-launching

  3. #3
    Lsdmeasap's Avatar
    Lsdmeasap is offline GIGABYTE Guru
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    PCB Island
    Posts
    25,940

    Default Re: Question about e8400 voltage and stability

    I would set ram voltage to 2.1 for now to be sure that is not part of the issue.

    Then I would say try these changes, along with possibly more Vcore. You are using to much voltage and that is likely causing the failures >>>

    CPU Termination…..... 1.200V*.......: 1.33-1.34


    MCH/ICH
    MCH Core…………….....1.100V...........: 1.24-1.28
    MCH Reference….…….0.800V...........; .76 (auto)
    MCH/DRAM Ref.…......0.900V...........: .9 (auto)
    ICH I/O……………….....1.500V............: 1.55
    ICH Core…………...……1.100V............: 1.14-1.2

  4. #4
    Join Date
    Mar 2009
    Posts
    22

    Default Re: Question about e8400 voltage and stability

    LSD, thanks for your suggestions. I just couldn't get them to work, in either the lower or upper ranges. I have to use termination of 1.38 with any of the other voltages you suggested in order to boot, but from there it seems far from stable. I am going to stick with 4.0Ghz since 4.2 is being difficult and I am not comfortable with the voltages needed and temps being generated!

    Now, I am wondering if I might be able to tweak the timings on my RAM a little bit since I bumped them up for overclocking, but I'm not sure where to start or what to try. Do you have any suggestions? Here are my 4.0Ghz settings.

    MB Intelligent Tweaker(M.I.T.)
    Robust Graphics Booster ...............: Auto
    CPU Clock Ratio ..........................: 9x
    Fine CPU Clock Ratio.....................:. +0.0
    CPU Frequency ...........................: 4.0ghz

    Clock Chip Control
    Standard Clock Control
    CPU Host Clock Control..................: [Enabled]
    CPU Host Frequency (Mhz) ............: 445
    PCI Express Frequency (Mhz) .........: 100

    C.I.A.2 .................................:[Disabled]

    Advanced Clock Control [Press Enter]
    CPU Clock Drive...........................: 800
    PCI Express Clock Drive.................: 900
    CPU Clock Skew (ps)....................: 0
    MCH Clock Skew (ps)...................: 0

    DRAM Performance Control
    Performance Enhance...................: [STANDARD]
    Extreme Memory Profile (X.M.P.).....: Disabled
    (G)MCH Frequency Latch...............: 333
    System Memory Multiplier ..............: 2.0B
    Memory Frequency (Mhz) ..............: 890 mhz
    DRAM Timing Selectable ................: [Manual]

    Standard Timing Control
    CAS Latency Time........................ 5
    tRCD ......................................... 5
    tRP'........................................... 5
    tRAS.......................................... 18

    Advanced Timing Control
    tRRD........................................... 3 (auto)
    tWTR.......................................... 3 (auto)
    tWR............................................ 6 (auto)
    tRFC........................................... 56 (manual)
    tRTP........................................... 3 (auto)
    Command Rate (CMD) ....................: 0 (auto)

    Driving Strength Profiles
    Driving Strength ............................ 1066 for both channels

    Channel A
    Static tRead Value.........................: 9 (manual)
    tRD Phase0 Adjustment...................:Auto 0
    tRD Phase1 Adjustment...................:Auto 0
    tRD Phase2 Adjustment .................:Auto 0
    tRD Phase3 Adjustment..................:Auto 0
    Trd2rd(Different Rank)....................:Auto 6
    Twr2wr(Different Rank)...................:Auto 6
    Twr2rd(Different Rank)...................:Auto 5
    Trd2wr(Same/Diff Rank)..................:Auto 8
    Dimm1 Clock Skew Control...............:Auto ps
    Dimm2 Clock Skew Control...............:Auto ps

    Channel B
    Static tRead Value.........................: 9 (manual)
    tRD Phase0 Adjustment...................:Auto 0
    tRD Phase1 Adjustment...................:Auto 0
    tRD Phase2 Adjustment .................:Auto 0
    tRD Phase3 Adjustment..................:Auto 0
    Trd2rd(Different Rank)....................:Auto 6
    Twr2wr(Different Rank)...................:Auto 6
    Twr2rd(Different Rank)...................:Auto 5
    Trd2wr(Same/Diff Rank)..................:Auto 8
    Dimm1 Clock Skew Control...............:Auto ps
    Dimm2 Clock Skew Control...............:Auto ps

    Motherboard Voltage Control
    Voltage Type.………... Manual
    Load Line Calibration......................... [Disabled]
    CPU
    CPU Vcore….……….........................: 1.2625 (manual)

    CPU Termination…..... 1.200V*.......: 1.2 (manual)

    CPU PLL…………………....1.500V*.......: 1.5 (manual)

    CPU Referen.…………....0.755V*.......: .76 (auto)



    MCH/ICH
    MCH Core…………….....1.100V...........: 1.3 (manual)
    MCH Reference….…….0.800V...........; .76 (auto)
    MCH/DRAM Ref.…......0.900V...........: .9 (auto)
    ICH I/O……………….....1.500V............: 1.5 (manual)
    ICH Core…………...……1.100V............: 1.1 (manual)

    DRAM
    DRAM Voltage ……....1.800V............: 2.0v (manual)
    DRAM Termination .…0.900V............: 0.9 (auto)
    Channel A Reference 0.900V............: 0.9 (auto)
    Channel B Reference 0.900V............: 0.9 (auto)

    Advanced Settings
    Limit CPUID Max. to 3.....................: [Disabled]
    No-Execute Memory Protect............: [Enabled]
    CPU Enhanced Halt (C1E)................: [Disabled]
    C2/C2E State Support....................: [Disabled]
    x C4/C4E State Support..................: [Disabled]
    CPU Thermal Monitor 2(TM2) ...........: [Enabled]
    CPU EIST Function.........................: [Disabled]
    Virtualization Technology................: [Disabled]

    Integrated Peripherals
    Legacy USB Storage Detect ..............[Disabled]
    **thepieguy**
    CPU : Core2Duo E8400 @ 4.0Ghz, 1.2625v (BIOS)
    Power: CORSAIR CMPSU-400CX
    Mainboard : Gigabyte GA-EP45-UD3R
    CPU Cooler : Xigmatek HDT-S1283
    RAM : OCZ Reaper HPC DDR2 800 4GB (2 x 2GB) OCZ2RPR800C44GK
    Video Card : Sapphire ATI Radeon HD 4830
    Optical Drive : LITE-ON iHAS122-04
    OS : Windows XP SP3 32bit

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