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Thread: VTT/CPU Termination and CPU Vcore Similarity?




  1. #1

    Default VTT/CPU Termination and CPU Vcore Similarity?

    Recently when overclocking my C0 E8400 I found that I could achieve 3.83 GHZ with a 1.34vcore and 1.1v Termination (Undervolted) to be stable!

    However, when overclocking to 4ghz, i needed 1.4250vcore and cant dip below 1.36 Termination!

    What is the link between termination and vcore, I have heard Termination should be set just off the load Vcore, is this correct?

    Why have I had such strange results?
    Last edited by Dodgexander; 04-29-2009 at 02:35 PM.
    Motherboard: Gigabyte GA-EP45-UD3R
    CPU: E8400 C0
    Memory: Team Xtreem Dark PC2 8500 DDR2 1066MHz CL5 (2*2GB)
    GPU: XFX GTX280
    Sound: Xonar HDAV Deluxe
    HDD's: WD VelociRaptor, WD Blue AAKS, WD Blue 2500BB
    PSU: Corsair HX620
    Case: Sharkoon Rebel12 Value
    CPU Cooler: Xigmatek Achilles S1284C
    Fans: Intake & Extract Top: Sharkoon 140MM 5v mod, Intake Bottom Opposite HDD's: Scythe 120mm Low RPM Drive Bay
    HDD's In 5.25 bay held in 2x Nexus DoubleTwins
    Disc Drives: Blu Ray/HDDVD LG GGCH20L, Pioneer DVR-216DBK
    Monitor: Samsung LE40M86B
    Receiver: Harman Kardon AVR255
    Speaker System: Q Accoustics 5.1i System

    Natalya Simonova: Do you destroy every vehicle you get into?
    James Bond: Standard operating procedure. Boys with toys.
    Goldeneye

  2. #2
    Lsdmeasap's Avatar
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    Default Re: VTT/CPU Termination and CPU Vcore Similarity?

    I hope those are voltage mistypes above?

    Termination needed will vary from CPU to CPU, and it also depends on what speeds you are running with what voltages. It does also help in NB Stability, but to what extent I am not sure.

    But in general, yes the more Vcore you need often means more Vtt would be needed as well

  3. #3

    Default Re: VTT/CPU Termination and CPU Vcore Similarity?

    Yeah lol, typos sorry. But it doesnt really make sense to me, is there a graph of comparison between vcore and reccomended vtt levels? How is that at 3.83ghz i need a vtt of 1.1v and for 4ghz I need one of 1.36!! Doesnt seem to make any sense and makes overclocking harder.
    Motherboard: Gigabyte GA-EP45-UD3R
    CPU: E8400 C0
    Memory: Team Xtreem Dark PC2 8500 DDR2 1066MHz CL5 (2*2GB)
    GPU: XFX GTX280
    Sound: Xonar HDAV Deluxe
    HDD's: WD VelociRaptor, WD Blue AAKS, WD Blue 2500BB
    PSU: Corsair HX620
    Case: Sharkoon Rebel12 Value
    CPU Cooler: Xigmatek Achilles S1284C
    Fans: Intake & Extract Top: Sharkoon 140MM 5v mod, Intake Bottom Opposite HDD's: Scythe 120mm Low RPM Drive Bay
    HDD's In 5.25 bay held in 2x Nexus DoubleTwins
    Disc Drives: Blu Ray/HDDVD LG GGCH20L, Pioneer DVR-216DBK
    Monitor: Samsung LE40M86B
    Receiver: Harman Kardon AVR255
    Speaker System: Q Accoustics 5.1i System

    Natalya Simonova: Do you destroy every vehicle you get into?
    James Bond: Standard operating procedure. Boys with toys.
    Goldeneye

  4. #4
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    Default Re: VTT/CPU Termination and CPU Vcore Similarity?

    You need to increase VTT when you increase the FSB.

    You shouldn't need 1.36 VTT, have you tried tweaking your CPU and MCH References?

    I can do 500FSB stable on 1.28 VTT.
    CPU: Intel C2Q Q6600 G0 @ 3.2GHz W/ 1.184v (Max Overclock - 4.1GHz ON AIR)
    Mobo: Gigabyte EP45-UD3P (Max Overclock - 515FSB)
    RAM: CellShock 2GB PC2-8500 @ 1200MHz 5-5-5-15 (Max Overclock - 1300MHz 5-4-4-12)
    Video Card: Gainward HD4870 GS @ 775MHz/4000MHz (Max Overclock - 835MHz/1175MHz)
    Case: Antec 1200

  5. #5
    Lsdmeasap's Avatar
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    Default Re: VTT/CPU Termination and CPU Vcore Similarity?

    Ya, I was about to suggest the same Fatguy1992~

    For 4Ghz (450 or 500 FSB) you should not need more then 1.28-1.32/1.34, with 1.34 only being needed on some CPU's at 500+ FSB. 1.36 should not be needed at all until you are pressing on 550+ FSB

    Small jump in Mhz often means a larger jump in voltages at higher speeds, so that is why you see less may be needed at a lower speed

  6. #6
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    Default Re: VTT/CPU Termination and CPU Vcore Similarity?

    Here are the settings I use, they work great.

    Code:
    Robust Graphics Booster.........................[ Auto     ]
    CPU Clock Ratio.................................[ 6, 7, 8 whatever you want        ]
    CPU Frequency 4.1GHz............................[ 520x6  ]
     
    ******Clock Chip Control******
     
    CPU Host Clock Control..........................[ Enabled  ]
    CPU Host Frequency (Mhz)........................[ 520     ]
    PCI Express Frequency (Mhz).....................[ 100      ]
    C.I.A 2 [Disabled] 
     
     
    ******Advanced Clock Control******
    
    CPU Clock Drive..........................[800mV]
    PCI Express Clock Drive................[900mV]
    CPU Clock Skew..........................[0ps]
    MCH Clock Skew..........................[0ps]
    
    ******DRAM Performance Control******
     
    Performance Enhance.............................[ Standard    ]
    MCH Frequency Latch.........................[ 333MHz   ]
    System Memory Multipler.........................[ 2.00    ]
    Memory Frequency 1066............................[ 1040MHz      ]
    DRAM Timing Selectable..........................[ Manual   ]
     
    CAS Latency Time................................[ 5        ]
    tRCD............................................[ 5        ]
    tRP.............................................[ 5        ]
    tRAS............................................[ 15      ]
     
    PL = 10
    
    All the other mobo advanced timings are on auto.
    
    ******Motherboard Voltage Control******
     
    Load-Line Calibration...........................[ Enabled ]
    CPU Vcore         [ 1.25 ]...................[ 1.27v    ]
    CPU Termination   [ 1.20    ]...................[ 1.28v    ]
    CPU PLL           [ 1.50    ]...................[ 1.55v    ]
    CPU Reference     [ 0.760   ]...................[ 0.78v  ]
     
    MCH Core          [ 1.100   ]...................[ 1.3v    ]
    MCH Reference     [ 0.760   ]...................[ 0.75v   ]
    MCH/DRAM Reference [ 0.900   ]...................[ 1.10v   ]
    ICH I/O           [ 1.500   ]...................[ 1.50v   ]
    ICH Core          [ 1.100   ]...................[ 1.100v   ]
    
    DRAM Voltage     [ 1.800v]...................[2.20v]
    DRAM Termination [0.900v]...................[1.10v]
    Channel A Reference [0.900v]................[1.10v]
    Channel B Reference [0.900v]................[1.10v]
    For the RAM settings and voltage enter whatever your RAM needs etc same for Vcore. The important thing is the CPU and MCH References.
    CPU: Intel C2Q Q6600 G0 @ 3.2GHz W/ 1.184v (Max Overclock - 4.1GHz ON AIR)
    Mobo: Gigabyte EP45-UD3P (Max Overclock - 515FSB)
    RAM: CellShock 2GB PC2-8500 @ 1200MHz 5-5-5-15 (Max Overclock - 1300MHz 5-4-4-12)
    Video Card: Gainward HD4870 GS @ 775MHz/4000MHz (Max Overclock - 835MHz/1175MHz)
    Case: Antec 1200

  7. #7
    Lsdmeasap's Avatar
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    Default Re: VTT/CPU Termination and CPU Vcore Similarity?

    The important thing is MCH Ref, CPU ref can be done later should you wish to mess with it. But MCH Ref plays a large part in stability I think

  8. #8

    Default Re: VTT/CPU Termination and CPU Vcore Similarity?

    Yeah, MCH Ref, thats what I found before I realised my RAM was faulty (prior to my RMA). Always gathered I wouldnt have to play with this setting until I get in to extreeme teritory!

    Thanks L and fatguy1992.
    Motherboard: Gigabyte GA-EP45-UD3R
    CPU: E8400 C0
    Memory: Team Xtreem Dark PC2 8500 DDR2 1066MHz CL5 (2*2GB)
    GPU: XFX GTX280
    Sound: Xonar HDAV Deluxe
    HDD's: WD VelociRaptor, WD Blue AAKS, WD Blue 2500BB
    PSU: Corsair HX620
    Case: Sharkoon Rebel12 Value
    CPU Cooler: Xigmatek Achilles S1284C
    Fans: Intake & Extract Top: Sharkoon 140MM 5v mod, Intake Bottom Opposite HDD's: Scythe 120mm Low RPM Drive Bay
    HDD's In 5.25 bay held in 2x Nexus DoubleTwins
    Disc Drives: Blu Ray/HDDVD LG GGCH20L, Pioneer DVR-216DBK
    Monitor: Samsung LE40M86B
    Receiver: Harman Kardon AVR255
    Speaker System: Q Accoustics 5.1i System

    Natalya Simonova: Do you destroy every vehicle you get into?
    James Bond: Standard operating procedure. Boys with toys.
    Goldeneye

  9. #9
    Lsdmeasap's Avatar
    Lsdmeasap is offline GIGABYTE Guru
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    Default Re: VTT/CPU Termination and CPU Vcore Similarity?

    Ahh sometimes it can need an adjustment at any setting, depends on the board, ram, and timings/voltages you are trying to stabilize

    Good luck and keep us posted of your progress

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