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Thread: help with overclocking e8400




  1. #1
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    Default help with overclocking e8400

    Hi, I am trying to overclock my e8400 on a Gigabyte ep43-ds3 mobo. I have overclocked it to 3.6Ghz (400x9) but when I open CPU-z the freqency switches between 2.6 (400x6) and the 3.6 which I have set it at every now and then. I have set the CIA thing to Disabled but other than that I dont really know what to do! I used to run a similar overclock on this machine a few months ago and Im sure it didn't happen then! Any help would be much appreciated.

    Thanks in advance :)

  2. #2
    Lsdmeasap's Avatar
    Lsdmeasap is offline GIGABYTE Guru
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    Default Re: help with overclocking e8400

    You need to disable C1E and EIST in the BIOS, then it will stop.

    Also in windows power options, if you are using Vista or Win7, go to advanced, then CPU and be sure Min/Max is set to 100 (or just choose High Performance Profile, but still check these are set to 100/100)

  3. #3
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    Default Re: help with overclocking e8400

    That fixed it, thanks a lot mate! Just out of interest, I am currently running all my voltages on Auto. I read that this will allow the mobo to up the vcore and toher volatges if necessary but I would like your opinion, should I increase them to suit my (albeit quite small) overclock?

    Cheers.

  4. #4
    Chike is offline Senior Member
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    Default Re: help with overclocking e8400

    Please post a screen capture of EasyTune -> Tuner -> Advanced -> Voltage tab.
    The BIOS will increase voltages automatically, but may over volt some of them.
    Pleas post also a template with your current settings using the template from this post
    What steps/increments available for VTT(CPU Termination), PLL, MCH Core, and DRAM Voltage?

  5. #5
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    Default Re: help with overclocking e8400

    Hi, thanks for the interest in my problem, Ill do my best to answer your questions.

    Heres a screenie of EasyTune:

    Attachment 2929

    Heres my BIOS settings, I think theyre accurate, when I get a chance Ill double check them. BTW I didnt note down the default voltages in the BIOS (I have all the voltages set to Auto) but if you would like them Ill find out what they are.

    Code:
    Motherboard: Gigabyte EP43-DS3, BIOS F9
    Cpu: E8400
    Ram: Kingston PC2-6400 4Gb in 2x2Gb DIMMs
    Power Supply Unit: Antec TruePower New 650W
    
    MB Intelligent Tweaker(M.I.T.)
    Robust Graphics Booster -------------- : [Auto]
    CPU Clock Ratio ---------------------- : [9x]
    Fine CPU Clock Ratio ----------------- : [0.0]
    CPU Frequency ---------------------: 3.6Ghz
    
    Clock Chip Control
    Standard Clock Control
    CPU Host Clock Control --------------- : [Enabled]
    CPU Host Frequency (Mhz) --------------: [400]
    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) ------------------ : [???]
    MCH Clock Skew (ps) ------------------ : [???]
    
    DRAM Performance Control
    Performance Enhance ------------------- : [Standard]
    Extreme Memory Profile --- (X.M.P.) --- : [Disabled]
    (G)MCH Frequency Latch ---------------- : [400]
    System Memory Multiplier -------------- : [2.00D] <-- this is the setting that you are using
    Memory Frequency (Mhz) ---------------- : [800 800]
    DRAM Timing Selectable ---------------- : [Auto]
    
    Standard Timing Control
    CAS Latency Time -------- ?? ---------- : [Auto]
    tRCD ------------------- ?? ---------- : [Auto]
    tRP --------------------- ?? ---------- : [Auto]
    tRAS ------------------- ?? ---------- : [Auto]
    
    Advanced Timing Control
    tRRD ------------------- ?? ---------- : [Auto]
    tWTR ------------------- ?? ---------- : [Auto]
    tWR --------------------- ?? ---------- : [Auto]
    tRFC ------------------- ?? ---------- : [Auto]
    tRTP ------------------- ?? ---------- : [Auto]
    Command Rate (CMD) -------------------- : [Auto]
    
    Driving Strength Profiles
    Driving Strength --------- : Press Enter
    
    Channel A
    Static tRead Value --------------------- : [Auto]
    tRD Phase0 Adjustment ------------------ : [Auto]
    tRD Phase1 Adjustment ------------------ : [Auto]
    tRD Phase2 Adjustment ------------------ : [Auto]
    tRD Phase3 Adjustment ------------------ : [Auto]
    Trd2rd(Different Rank) ----------------- : [Auto]
    Twr2wr(Different Rank) ----------------- : [Auto]
    Twr2rd(Different Rank) ----------------- : [Auto]
    Trd2wr(Same/Diff Rank) ----------------- : [Auto]
    Dimm1 Clock Skew Control --------------- : [Auto] ps
    Dimm2 Clock Skew Control --------------- : [Auto] ps
    
    Channel B
    Static tRead Value --------------------- : [Auto]
    tRD Phase0 Adjustment ------------------ : [Auto]
    tRD Phase1 Adjustment ------------------ : [Auto]
    tRD Phase2 Adjustment ------------------ : [Auto]
    tRD Phase3 Adjustment ------------------ : [Auto]
    Trd2rd(Different Rank) ----------------- : [Auto]
    Twr2wr(Different Rank) ----------------- : [Auto]
    Twr2rd(Different Rank) ----------------- : [Auto]
    Trd2wr(Same/Diff Rank) ----------------- : [Auto]
    Dimm1 Clock Skew Control --------------- : [Auto] ps
    Dimm2 Clock Skew Control --------------- : [Auto] ps
    
    Motherboard Voltage Control
    CPU
    Voltage Types------------ Normal -------- Current -----
    Load-Line Calibration ----------------- : [Disabled]
    CPU Vcore --------------- ?.????? ---- : [Auto]
    
    CPU Termination --------- ?.???V* ----- : [Auto]
    CPU PLL ----------------- ?.???V* ----- : [Auto]
    
    CPU Reference ----------- ?.???V* ----- : [Auto]
    CPU Reference2 ---------- ?.???V* ----- : [Auto]
    
    MCH/ICH
    MCH Core ---------------- ?.???V ------- : [Auto]
    MCH Reference ----------- ?.???V ------- : [Auto]
    MCH/DRAM Ref ------------ ?.???V ------ : [Auto]
    ICH I/O ----------------- ?.???V ------- : [Auto]
    ICH Core ---------------- ?.???V ------- : [Auto]
    DRAM
    DRAM Voltage ------------ ?.???V ------- : [Auto]
    DRAM Termination -------- ?.???V ------- : [Auto]
    Channel A Reference ----- ?.???V ------- : [Auto]
    Channel B Reference ----- ?.???V ------- : [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]
    The increments for the voltages you asked for are:

    CPU Termination - 0.02V steps
    PLL - 0.02V steps
    MCH Core - 0.02V steps
    DRAM Voltage - 0.02V steps

    Thanks for your time.

  6. #6
    Chike is offline Senior Member
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    Default Re: help with overclocking e8400

    Most target voltages look good, except PLL that may be set to 1.55-1.57v, there's no need for more.

    Vcore may be set lower, it depends on the CPU. It's not a concern though, nothing to worry about.

    You may try and set tRD(Static tRead Value in BIOS, Performance Level in MemSet) to 8(if set higher by auto) for a lightly better read bandwidth and lower latency. This may require 1-2 steps more MCH Core and/or DRAM Voltage(note that currently DRAM Voltage target value is 1.9v).
    I see XMP is disabled, is this a perrformance memory that you are using?

    Have you stressed those settings, how and for how long if you did?
    What are core temperatures uunder load?

  7. #7
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    Default Re: help with overclocking e8400

    OK thanks Ill adjust my PLL voltage accordingly. Just to clarify, when you talk about changing the static tRead value in the BIOS are you talking about the variable first in the Channel A and Channel B catagories? Do I leave the Standard and Advanced Timing Controls alone?

    No it is not performance RAM i am using, its cheapo stuff I think, should I have XMP turned on? I am not entirely sure what it does.

    I ran a Prime95 stress test for about 20 mins last night and there were no errors, my core temps were about 50 degC under load which is low probably because I have a decent aftermarket cooler for my CPU. Ill run a longer stress test later when I am back home if you think it necessary?

  8. #8
    Chike is offline Senior Member
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    Default Re: help with overclocking e8400

    Yes, the first option in channel advanced settings, set same value for both channels.
    You can leave standard and advanced timings auto as long the memory is set to it's default frequency.
    You can test memory performance with MaxxMEM² - PreView.

    If the ram has EPP it must be performance ram, if it does not have EPP then XMP should be missing from BIOS settings.
    Can you post a screen capture of MemSet main and SPD(click spd) windows?

    20 minutes are not enough, you need to run at least 6-8 hours of Prime95 blend test. Recommended to run small and large FFT for a couple of hours too.
    IBT(Intel Burn Test) or LinX 5-10 runs at max stress level are also recommended. If settings are OK you should get 24+ GFlops with your current OC.

  9. #9
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    Default Re: help with overclocking e8400

    OK thanks for your help, Ill post the information you requested once I get home from work.

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