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Thread: E8400 Overclock to 4.00




  1. #11
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    Default Re: E8400 Overclock to 4.00

    Quote Originally Posted by Chike View Post
    I'd leave Performance Enhance standard, then if FFT >- 128K try VTT with combinations of CPU & MCH references.

    Advanced Timing Control
    tRRD...........................................4


    ^ that might be unstable for you. I was able to run Prime95 for 1.5 hours and kept bombing out. Changed that value to "5" and was good to go.

    Also make sure you have LLC " Load line Calibration enabled. Then you should be good to go. Im rumming 1.328v (full load) to be stable with that chipset at 4.00Ghz.
    ASUS P8P67 rev3.1 | i5 2500K @ 4.5Ghz | Vcore: 1.300
    MSI 460GTX Hawk Talon Attack (900/4000) | 23C Idle / 65C max load / +100mV
    Kingston HyperX | DDR3 1600Mhz | Corsair H60 | 36C Idle / 65C max load
    500GB Seagate Barracuda 7200rpm| OCZ 600watt SXS PSU
    LG E2050T LED monitor
    3DMark11 P4560


  2. #12
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    Default Re: E8400 Overclock to 4.00

    Going to try lowering fsb, trying to get stable at slower speed first.

    What is the highest safe vcore for 24/7 use ?
    Last edited by porky123; 07-07-2010 at 09:06 AM.
    Gigabyte EP45-UD3R Rev 1.1 Bios F12
    Intel Core 2 Duo E8400 @ 4.005
    Antec 902 Case w/ Corsair hx520w
    Gigabyte GTX460 1GB
    Corsair Dominator PC-8500 2X2 GB

  3. #13
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    Default Re: E8400 Overclock to 4.00

    i have theE8400 but its a CO stepping not EO.(what is yours? CO or EO?) 3.83ghz is the best i can do stable, 24/7 but i did have it to 4.0ghz and my vcore was set to 1.41v i think it was. i wouldnt recomend any higher for 24/7 and you want to keep it for a while.. i know others have gotten alot higher and stable but im just a little scared the chip wont last that long that high of a vcore. just my 2cents.
    GA-EP45-UD3P 1.6rev
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  4. #14
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    Default Re: E8400 Overclock to 4.00

    Quote Originally Posted by cincyrob View Post
    i have theE8400 but its a CO stepping not EO.(what is yours? CO or EO?) 3.83ghz is the best i can do stable, 24/7 but i did have it to 4.0ghz and my vcore was set to 1.41v i think it was. i wouldnt recomend any higher for 24/7 and you want to keep it for a while.. i know others have gotten alot higher and stable but im just a little scared the chip wont last that long that high of a vcore. just my 2cents.
    I have an E0 Stepping. Seems to finally be stable at 3.82 (425X9) with 1.32 vcore. Prime is still going after 10hrs.
    Gigabyte EP45-UD3R Rev 1.1 Bios F12
    Intel Core 2 Duo E8400 @ 4.005
    Antec 902 Case w/ Corsair hx520w
    Gigabyte GTX460 1GB
    Corsair Dominator PC-8500 2X2 GB

  5. #15
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    Default Re: E8400 Overclock to 4.00

    Intel rates the max " safe " voltage to this chip at 1.36v.

    You could probably set it to 1.4v in the bios with LLC enable. The vdroop should drop it to around 1.36v to the chip. Id say thats the max to be safe.
    ASUS P8P67 rev3.1 | i5 2500K @ 4.5Ghz | Vcore: 1.300
    MSI 460GTX Hawk Talon Attack (900/4000) | 23C Idle / 65C max load / +100mV
    Kingston HyperX | DDR3 1600Mhz | Corsair H60 | 36C Idle / 65C max load
    500GB Seagate Barracuda 7200rpm| OCZ 600watt SXS PSU
    LG E2050T LED monitor
    3DMark11 P4560


  6. #16
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    Default Re: E8400 Overclock to 4.00

    seeing you have the EO stepping you should be able to get 4.0ghz out of it. its just some small minor tweaking to get it there.3.82ghz to 4.0ghz. your not gonna notice the small amount you gain from the higher oc. ive ran my E8400 CO at 3.80ghz now for over a year at that speed and have no issues what so ever.. other than braggin rights no need it burning the chip up, unless ya want a new one...lol once again its just my 2cents...
    GA-EP45-UD3P 1.6rev
    Q9550 @ 451x8.5 3.83ghz SLB8V 1.296 vcore in bios
    Batch #L846B715
    G-Skill ddr2 1066 2x1gb running at 1082mhz??
    OCZ Vendetta 2 with 120mm fan
    Corsair HX650w PSU with a 120mm fan
    Nvidia GeForce 8800 GTS
    WD2500AAKS
    WD3200AAKS
    WD500GB GP
    WD1001FALS
    All housed in the Big Red Hemi
    CM HAF 922 1X200MM,2X200MM RED LED & 1x140mm rear fan
    Burners=
    Sony Optaric Nec AD7220S
    Sony Optaric Nec AD7240S
    Lite-on IHAS324-9-A x2

  7. #17
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    Default Re: E8400 Overclock to 4.00

    I actually got good preformance boosts all the way up to 4.0Ghz. I ran benchmarks and tests from 3.6Ghz up. It wasn't until I went higher then 4.0Ghz, that the gains became minimal per clock cycle.

    I was able to run 4.25Ghz stable with a 2.0D Strap and a vcore of 1.348V Full Load. But considering the minimal gain and the cpu 10C hotter full load then compared to 4.0Ghz. I didn't feel it was worth it.

    Just a heads up. for me, At 3.6Ghz ( 3Dmark06 : 16,800 ) At 4.0Ghz ( 3Dmark06 : 18,000 ) *this is with a GTX285
    I got a GPU score of 12,000+ in Vantage @ 4.0Ghz

    4.0Ghz seems to be the sweet spot with this chip. Atleast the E0 revision.
    Last edited by Triton05; 07-08-2010 at 01:57 AM.
    ASUS P8P67 rev3.1 | i5 2500K @ 4.5Ghz | Vcore: 1.300
    MSI 460GTX Hawk Talon Attack (900/4000) | 23C Idle / 65C max load / +100mV
    Kingston HyperX | DDR3 1600Mhz | Corsair H60 | 36C Idle / 65C max load
    500GB Seagate Barracuda 7200rpm| OCZ 600watt SXS PSU
    LG E2050T LED monitor
    3DMark11 P4560


  8. #18
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    Default Re: E8400 Overclock to 4.00

    Thanks to everyone who replied. I think im gonna leave it to 3.82 for now and then, when I have more time try to push to 4.0. I think I may have been running vcore too low to hit 4.0 because I didnt try over 1.328. I still got a little headroom til I get 1.365

    So thanks to everyone, you have been so helpfull.
    Gigabyte EP45-UD3R Rev 1.1 Bios F12
    Intel Core 2 Duo E8400 @ 4.005
    Antec 902 Case w/ Corsair hx520w
    Gigabyte GTX460 1GB
    Corsair Dominator PC-8500 2X2 GB

  9. #19
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    Lsdmeasap is offline GIGABYTE Guru
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    Default Re: E8400 Overclock to 4.00

    Quote Originally Posted by Triton05 View Post
    Intel rates the max " safe " voltage to this chip at 1.36v.

    You could probably set it to 1.4v in the bios with LLC enable. The vdroop should drop it to around 1.36v to the chip. Id say thats the max to be safe.
    Incorrect, just so everyone knows. Intel's rated Max Vcore is 1.45 for these CPU's, see page 17
    http://download.intel.com/design/pro...hts/318732.pdf

    What you refer to is MAX VID, which means the maximum voltage a CPU will leave the factory using for spec speeds.

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