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Thread: Normal Voltage for E6750




  1. #21
    Ken429 is offline Senior Member
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    Default Re: Normal Voltage for E6750

    Couple of issues: 1. OCCT does not seem to be generating the thread0.txt or thread1.txt on either of my machines. Is there a switch somewhere? I know several years ago it was there when I was testing the abit systems. Did it go away in OCCT3.1? 2. I changed CPU Ref and MCH Ref to AUTO and the system failed after 20 minutes with a Core 1 Error (Max Temp from OCCT 48c. I then changed the VTT to 1.28V and the system failed after 18 minutes (Max Temp from OCCT 49c). Do I keep going down your list even though I am losing ground or should I back off the VTT and go on to step 3?

  2. #22
    Chike is offline Senior Member
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    Default Re: Normal Voltage for E6750

    I am curious about MCH/DRAM Reference and DRAM Termination, did you find setting them manually below their default made any improvement?

  3. #23
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    Default Re: Normal Voltage for E6750

    Don't continue with the test settings list.
    Go back to your stable 1 hour OCCT test settings and run two more OCCT tests for two hours each.
    Test 1 will use the small dataset option.
    Test 2 will use the large dataset option.

    Extra Credit homework assingment: repeat these two tests using your 2x2GB Muskin 10066 memory where Dram Voltage = 2.02 and MCH Core = 1.24 or 1.26.

    With my E6550/Mushkin setup, 4-4-4-12 primary memory timings are stable up to about 875MHz. YMMV
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  4. #24
    Ken429 is offline Senior Member
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    Default Re: Normal Voltage for E6750

    Now your tell me. I have been busy waiting for some more guidance. For what it is worth:

    • Changed MCH Ref and CPU Ref to Auto - Ran ~20 minues Core 1 Error Max Temp 48c.
    • Left above on Auto and increased VTT to 1.28V - Ran ~18 minutes Core 1 Error Max Temp 49c.
    • Left (1) on Auto, decreased VTT to 1.26V and increased DRAM Voltage to 2.12V - Ran ~9 minutes Core 0 Error Max Temp 49c.
    • Left (1) on Auto, decreased DRAM Voltage to 2.1V and changed tRFC to 48 - Ran ~33 minutes Core 0 Error Max Temp 50c.


    Does this tell you guys anything? ProfJim, what about Chike's suggestion to go in the opposite direction? WHAT ABOUT THE MISSING "THREAD?.TXT" FILES?
    Last edited by Ken429; 03-05-2010 at 11:46 PM.

  5. #25
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    Default Re: Normal Voltage for E6750

    Several thoughts:
    Sometimes a 4x1GB memory setup seems to be more troublesome than a 2x2GB setup.

    Reference Volt Settings
    MCH and Cpu reference volt settings usually aren't needed until overclocks reach about 4GHz speeds.
    Quad core processors respond best when the bios setting is increased.
    Dual core processors respond best when the bios setting is decreased.
    The basic procedure for changing these settings is:
    1. set Cpu Termination (VTT) = 1.20
    2. set the MCH and/or Cpu reference volt setting(s) to the desired value
    3. set VTT back to the desired setting

    Sometimes increasing VTT will help with stress test stability.

    To eliminate memory as the possible problem, you can run the OCCT tests with 2x1GB of memory and also try a 2x2GB memory setup with slightly different voltage settings.
    425MHz FSB should be fairly easy with your hardware setup.

    FWIW, the only Thread*.txt files on my computer are in my OCCT v200a folder.
    There are none of these files in my OCCT v310 folder.
    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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  6. #26
    Chike is offline Senior Member
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    Default Re: Normal Voltage for E6750

    Quote Originally Posted by Ken429 View Post
    ProfJim, what about Chike's suggestion to go in the opposite direction?
    I made a suggestion?
    MCH/DRAM reference and DRAM termination are set manually to a value that is below defailt. I asked if you dound them to be stable more than default.

  7. #27
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    Default Re: Normal Voltage for E6750

    Just to clarify reference volt settings:

    CPU Termination (VTT) Automatically changes the following if manually set:

    • CPU Reference Voltage --- (63% of Default Vtt/1.20) ---.76 ET
    • CPU Reference2 Voltage -- (67% of Default Vtt/1.20)--- .80 ET
    • MCH Reference Voltage--- (63% of Default Vtt/1.20) ---.76 ET
    ===========================================

    DRAM Voltage Automatically changes the following if manually set:
    • MCH/DRAM Reference Voltage - (50% of Default Dram Voltage)
    • DRAM Termination Voltage ----- (50% of Default Dram Voltage)
    • Channel A Reference Voltage --- (50% of Default Dram Voltage)
    • Channel B Reference Voltage --- (50% of Default Dram Voltage)
    ===========================================

    With DRAM Voltage = 1.80 (the default setting), if you manually set each of the following to 0.90 volts:
    • MCH/DRAM Reference Voltage
    • DRAM Termination Voltage
    • Channel A Reference Voltage
    • Channel B Reference Voltage
    when you increase DRAM Voltage, the three settings will automatically increase, where the new settings will be 50% of new DRAM Voltage.
    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
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    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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  8. #28
    Ken429 is offline Senior Member
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    Default Re: Normal Voltage for E6750

    ProfJim, I ran OCCT for 2 hours on small and 2 hours on large at 400FSB. No problems. So what does that tell us other than the machine is fairly stable at 3.2 GHz. It's been running like that as my main machine for two years with never ever a crash.

    Chike, I lowered the MCH/DRAM Reference and the DRAM Termination by lowering the DRAM voltage to 1.8v (default) and made sure the other two reference voltages were also at default. I then lowered the reference voltages by one notch and raised the DRAM voltage back to 2.1v. Net net the reference voltages shown by ET6 were .830v versus .850v when left alone. OCCT reported a core error after only ~4 minutes. What did I do wrong?!

    ProfJim, raising the tRFC has been the only thing that has had a positive effect so far. Do we need to slow down the Corsair memory even more if I want a higher FSB? Changing the timing from 4-4-4-12 to 5-5-5-15 allowed OCCT to run @ 425 FSB for a full hour with no problems. However it would not go to 450 FSB but.... I'm beginning to think the RamGuy new from what he was talking about - 4 sticks @ 4-4-4-12 @ 400 FSB is about as good as it gets. I know the abit MB would only go to ~420FSB before the problems started. But back then it was heat I was worried about and just stopped because I was happy at 3.2GHz. Times change.

  9. #29
    profJim's Avatar
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    Default Re: Normal Voltage for E6750

    Your previous tRFC setting was probably too tight and raising it helped.
    It might be that your 4x1GB Corsair memory doesn't overclock well, but I would only expect this with cheap value ram, not Cas4 800Mhz ram. This is why I suggested testing your q9550's Mushkin 2x2GB 1066 ram in your E6750 system to see if you can overclock further.

    My Mushkin memory can't use 4-4-4-12 timings at 900MHz speeds. I've seen other 2x2GB 1066 kits that can run 4-4-4-12 stable at 900MHz or slightly higher speeds. Even though we have the same memory kits, yours might go slightly higher than my 875MHz 4-4-4-12 setup.

    Several forum members have successfully overclocked their systems to run with 8GB (4x2GB) of memory at 1000 - 1066MHz speeds and some of these systems were stable at 3.8 - 4.0GHz speeds.

    FWIW, I recently had a Prime95 (blend) error at 10 hours, 21 minutes. A one or two hour Prime95 or OCCT stress test is no where long enough to insure that a system is stable.
    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
    .


  10. #30
    Chike is offline Senior Member
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    Default Re: Normal Voltage for E6750

    Quote Originally Posted by Ken429 View Post
    Chike, I lowered the MCH/DRAM Reference and the DRAM Termination by lowering the DRAM voltage to 1.8v (default) and made sure the other two reference voltages were also at default. I then lowered the reference voltages by one notch and raised the DRAM voltage back to 2.1v. Net net the reference voltages shown by ET6 were .830v versus .850v when left alone. OCCT reported a core error after only ~4 minutes. What did I do wrong?!
    I have not suggested to make any changes.
    MCH/DRAM Reference and DRAM Termination were already set lower than default, and I asked if it was done intentionally to improve stability.
    Basically, if there was no good reason to set them manually, leave them auto.

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