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Thread: Normal Voltage for E6750




  1. #1
    Ken429 is offline Senior Member
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    Default Normal Voltage for E6750

    I am about to buy another EP45-UD3P MB for an "old" E6750 cpu that is currently installed on a now defunct abit IP35 Pro MB. I have always been concerned about how hot the cpu gets when OC'ed beyound 3.2GHz. Now I think I know - the abit is defaulting to 1.35V. That's as low as the BIOS will allow. It looks like the E6750 wants only 1.18V to run at stock! Will the EP45-UD3P board give it less voltage as a default and let me increase as needed?

  2. #2
    Chike is offline Senior Member
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    Default Re: Normal Voltage for E6750

    1.18 is the default value in BIOS?
    Make a registers text report with CPU-Z(click "About", click "Save Report (.TXT)" and see what Max VID is.
    For OC more than default is likely needed.

  3. #3
    Ken429 is offline Senior Member
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    Default Re: Normal Voltage for E6750

    Learned a new trick - thanks. CPUZ64 says the Max VID is 1.35V. So that means the abit BIOS is setting the starting "Default" voltage at the MAX! Will the Gigabyte board set up at the default VID of 1.18V and let me play with the voltages as needed. Seems like 1.35V is very high for 3.2GHz 24X7 usage - my Q9550 will run at 4 GHz at 1.35V. Any input on how much I can expect from the E6750 on the Gigabyte board. I would use the 4X1GB sticks of Corsair DDR2 800 C4 memory.

  4. #4
    Chike is offline Senior Member
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    Default Re: Normal Voltage for E6750

    Max VID in CPU-Z is max vcore for the processor at it's max stock speed.
    Max VID for the E6750 is 1.5v.
    The Q9550 is a newer 45nm processor which is different from the 65nm E6750 processor. BTW which stepping is your Q9550 C1 or E0?
    What is core voltage reading in CPU-Z under load like Prime95 for the E6750?

  5. #5
    Ken429 is offline Senior Member
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    Default Re: Normal Voltage for E6750

    OCCT says the Vcore is 1.18v when idle and 1.30-1.32V when the E6750 is under load (400FSB * 8 =3.2GHz). The Q9550 is E0 stepping and runs at 1.31V when idle and 1.265-1.28V under load (450FSB * 8.5 = 3.825GHz LLC Disabled). Strange, the BIOS on the abit board does about the exact opposite of the BIOS on the Gigabyte board. Back to my original question - should I buy the Gigabyte board and be able to run the E6750 at a lower Vcore and/or get a higher GHz with less heat? Just in case your going to ask, I have a whole box full of Zalman cpu coolers in every shape and size so I am not using the Intel stock cooler.

  6. #6
    Chike is offline Senior Member
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    Default Re: Normal Voltage for E6750

    I can't answer your original quetion, I don't know how high the E6750 will OC and with what voltages and temperatures.

    For the E6750 do you manually set voltages or do you use C.I.A. 2/auto settings? Do you use the same method for both processors?

    How hot does the E6750 get (core/CPU temps)?

  7. #7
    Ken429 is offline Senior Member
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    Default Re: Normal Voltage for E6750

    Oh well, for $100 I'll by another EP45-UD3P and let you know how it turns out.

  8. #8
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    profJim is online now Chief Munchkin + moderator
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    Default Re: Normal Voltage for E6750

    Your E6750 is similar to my E6550.
    The highest stable o/c with my cpu is 494 x 7 = 3.458GHz, with CPU Vcore = 1.36875.
    With your 8x cpu multiplier, you should be able to o/c to 3.90GHz or higher.
    I could run stability tests up to 528 x 7 = 3.696GHz, but my setup was never completely stable with FSB = 495MHz or higher. YMMV.

    Temperatures with my system are very good, see my signature.

    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
    Seasonic X650 80+ gold psu (650w) ~~ Xigmatek Balder HDT 1283 cpu cooler ~~ Cooler Master CM 690 case (RC-690-KKN1-GP)
    Samsung 830 128GB SSD MZ-7PC128B/WW (boot) ~~ WD Caviar Black WD6401AALS 640GB (data) ~~ ZM-MFC2 fan controller
    HT|Omega Striker 7.1 sound card ~~ Asus VH242H monitor [1920x1080] ~~ Logitech Z-5500 Digital 5.1 Speakers
    win7 x64 sp1 Home Premium ~~ CyberPower CP1500PFCLCD U.P.S
    .


  9. #9
    Ken429 is offline Senior Member
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    Default Re: Normal Voltage for E6750

    ProfJim - good to see your still on duty. I thought I would give "our" Q9950 system a rest and play with the E6750 system for awhile. I was surprised to see that the abit BIOS (CPUz64) shows 1.18V when E6750 is idle and jumps up to 1.32V under load (400 FSB * 8 = 3.2GHz). But... the temp also jumps up from 30C when idle to 54C under load. I have a Zalman CPNS 9500 on this thing in an all aluminum Lian Li PC60 case. I can see another Corsair H50 cooler on the horizon! Based on your stuff and the Max VID it looks like 1.35V is not out of line for this processor. I don't think the abit versus Gigabyte MB will make it run any cooler but I was trying to rationalize a new MB anyway since abit is no longer in business and W7 drivers for their OC'ing software does not exist. So...by next week I should have a EP45 UD3P MB and I'll probably be looking for some more help.

  10. #10
    profJim's Avatar
    profJim is online now Chief Munchkin + moderator
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    Default Re: Normal Voltage for E6750

    Your E6750 has a VID range = 0.85V 1.5V.
    CoreTemp will show you the specific "normal" VID for you cpu.
    Cpu-z "About" tab ---> Register Dump will display detailed system information, including "max vid" which will show the standard cpu VID.
    I was surprised to see that the abit BIOS (CPUz64) shows 1.18V when E6750 is idle and jumps up to 1.32V under load (400 FSB * 8 = 3.2GHz).
    It sounds like your Abit bios had EIST and C1E enabled for power saving. With these enabled, your cpu idle voltage and core speed will be reduced. Both of these will increase to the standard values when your system is under higher loads.

    Your core temperatures sound about right. With a decent air cooling setup, core temperatures will rise to about 50 (C) when running Prime95 or OCCT. Running IBT or LinX will raise core temperatures another 10+ degrees.

    As I recall, most of the original Core2Duo e6xxx processors had a stock VID in the 1.35 volt range.

    Good luck with your new mobo, we're here to help you with your overclock.
    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
    Seasonic X650 80+ gold psu (650w) ~~ Xigmatek Balder HDT 1283 cpu cooler ~~ Cooler Master CM 690 case (RC-690-KKN1-GP)
    Samsung 830 128GB SSD MZ-7PC128B/WW (boot) ~~ WD Caviar Black WD6401AALS 640GB (data) ~~ ZM-MFC2 fan controller
    HT|Omega Striker 7.1 sound card ~~ Asus VH242H monitor [1920x1080] ~~ Logitech Z-5500 Digital 5.1 Speakers
    win7 x64 sp1 Home Premium ~~ CyberPower CP1500PFCLCD U.P.S
    .


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