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Thread: FSB Overvoltage Control, is this setting VTT ?




  1. #1
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    Default FSB Overvoltage Control, is this setting VTT ?

    FSB Overvoltage Control, is this setting purely VTT or is it something else?
    I have done a ton of searching for the correct answer right here and over the web in regards to this setting and Gigabyte motherboards, but I still don't have a definative answer.

    I have a Gigibyte X48-DS5 motherboard and a Q9550 processor.

    The only way I can get this thing to go any where stable from 400-450 FSB is to ramp up the FSB Overvoltage Control to likely dangerous levels of +0.25v.
    Is this safe?
    Is it possible to set the FSB Overvoltage Control to the maximum +0.35v without damage to the processor.

    I have tried countless settings over the hours, days, weeks, and months. Both of my of own settings, and settings from the forums right here. Conclusion is I NEED FSB Overvoltage Control to remain stable. Question is... can I pump this voltage up safely?
    Last edited by L33; 04-13-2009 at 04:35 PM.

  2. #2
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    Default Re: FSB Overvoltage Control, is this setting VTT ?

    Obviously any overclocking is a risk anyway, but an increment of 0.25volts for Vtt is just part of that factor if overclocking is your thing.

    This may help:-
    AnandTech: The Gigabyte GA-X48T-DQ6 - Redefining the High End?

    Edit:-
    According to the Q9550 data sheet:-
    http://download.intel.com/design/pro...hts/318726.pdf

    Vtt should be at 1.2volts (approx) by design for the 4 series of Chipset (page 20 above), so in theory +0.25v, takes Vtt to 1.45volts which according to the above data sheet (page 19) is the "Absolute Maximum". See page 19 section 2.6.1 for Intel Absolute Ratings and what they mean.
    Last edited by VorLonUK; 04-13-2009 at 08:02 PM.
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    Default Re: FSB Overvoltage Control, is this setting VTT ?

    Yes, FSB Voltage is VTT. If you can bump it to the max, well, 1.45v is pushing it, but if your temps are good it should be okay.
    Pro hardware technician for PC, Laptop and Sound equipment.

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    Default Re: FSB Overvoltage Control, is this setting VTT ?

    I hear that on some P45 chipsets VTT defaults at 1.1v, is this not the case with X48 chipset, is the X48 default VTT 1.2v?
    If the absolute max VTT voltage is 1.45v. Will a setting of +0.20v bringing the VTT to 1.40v be playing it safe?
    Do I have to remain in the +5% max which = 1.26v, in turn means I can really only give the FSB Overvoltage Control a max of +0.05v? If so that means any chance of a stable 400FSB with my quad core Q9550 is basically unobtainable?

  5. #5
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    Default Re: FSB Overvoltage Control, is this setting VTT ?

    I hear that on some P45 chipsets VTT defaults at 1.1v
    It's difficult to know one way or the other, short of measuring VTT.

    As per my previous post, the Intel data sheet defines the requirements for when using a quad CPU on either 3x & 4x series of Intel Chipset.

    According to the Q9550 data sheet:-
    http://download.intel.com/design/pro...hts/318726.pdf

    Vtt should be at 1.2volts (approx) by design for the 4 series of Chipset (page 20 above), so in theory +0.25v, takes Vtt to 1.45volts which according to the above data sheet (page 19) is the "Absolute Maximum". See page 19 section 2.6.1 for Intel Absolute Ratings and what they mean.
    I would have thought Gigabyte have followed this in their design, unless of course there are technical reasons that they have been able to keep the value of VTT lower by default.

    On another note, you'll find the high memory/high CPU overclocks are usually found to be better on the dual core cpu's and not the quads. Looking at both OCZ and Corsair forums and the "official" responses, high advertised clock speeds have usually been achieved with dual cores.
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  6. #6
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    Default Re: FSB Overvoltage Control, is this setting VTT ?

    If your temps are fine then you can use +0.2-0.3 or so without issues, your CPU will long outlast your desire to own it. Are you sure you are using enough Vcore and MCH, and not using to little of either of those making you think you need more Vtt?

    What is your Full specs? Mind giving me your settings to have a look? >>

    This is Just a template I use to ask people their settings, pay no attention to the numbers in it, replace with yours

    CPU = Model #
    Motherboard = Model, Revision #
    BIOS Version =
    Ram = Brand, Model#, Part#, And or Link

    Code:
    Robust Graphics Booster___________ [Auto]
    CPU Clock Ratio ____________ [8] 
    Fine Clock Ratio ____________[0.5]
    CPU Host Clock Control_ [Enabled]
    CPU Host Frequency (MHz)__________ [450] 
    PCI Express Frequency (Mhz)_______ [100]
    C.I.A. 2__________________________ [Disabled]
    System Memory Multiplier (SPD)____ [2.00]
    DRAM Timing Selectable_______ SPD __ [Manual]
    
    Performance Enhance = [Standard]
    
    CAS Latency Time________________ 
    Dram RAS# to CAS# Delay_________ 
    Dram RAS# Precharge Delay_______
    Precharge Delay (tRAS)__________ 
    
    ACT to ACT Delay (tRRD)_________ 
    Rank Write to READ Delay________ 
    Write to Precharge Delay_________ 
    Refresh to ACT Delay______________ 
    Read to Precharge Delay__________
    Static tRead Value_______________
    Static tRead Phase Adjust________ [Auto]
    
    CPU/PCIEX Clock Driving Control [800mV]
    CPU Clock Skew Control [normal]
    GMCH Clock Skew Control [Normal]
    
    System Voltage Control____ [Manual]
    DDR2 OverVoltage Control__ [+0.300V] 
    PCI-E OverVoltage Control_ [+0.1V] 
    FSB OverVoltage Control___ [+0.1V] 
    (G)MCH OverVoltage Control [+0.1V] 
    CPU Voltage Control_______ [1.25]
    
    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] Enabled if you use Vmware/Virtual PC
    
    Integrated Peripherals
    Legacy USB Storage Detect___________________[Disabled] *Note* Must be enabled to flash from USB

    X48 may just need more voltage then say P45 to keep a Quad stable at 400+ FSB, so that is why you find yourself needing more then the normal amount you see users using today. Most users are on P45 which does High FSB With ease

  7. #7
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    Default Re: FSB Overvoltage Control, is this setting VTT ?

    Maybe not enough Vcore as my VID is stock at 1.275v. I have put the voltage upto 1.325v at times, but no luck.
    My cooling is reasonable, Zalman 7000cu. It may come as a surprise, that it can keep the temperture, using the above voltages fully loaded with OCCT at ~20c room temp and ~60-65c max.
    Once the MCH gets above +0.30 the computer is prone to locking up, even with a fan over the MCH heatsink cooling it.
    Would VTT at +0.30v = 1.5v, which could be very early death?


    CPU = Q9550, E0, VID 1.275V
    Motherboard = Gigabyte GA-X48-DS5, Revision 1.0? (purchase 1 year ago)
    BIOS Version = F8d beta, was on and have tryed F7
    Ram = G Skill, F2-8000CL5-2GBPQ, 4x 2GB


    Computer Type: ACPI x64-based PC
    Operating System: Microsoft Windows Vista Ultimate Service Pack 1
    CPU Type: QuadCore Intel Core 2 Quad Q9550 E0
    Motherboard Name: Gigabyte GA-X48-DS5
    System Memory: 8192 MB G Skill F2-8000CL5-2GBPQ 4x2GB
    BIOS Version: F8d beta
    Video Adapter #1: NVIDIA GeForce GTX 275 (896 MB)
    Video Adapter #2: NVIDIA GeForce 8800 GTS 512 (512 MB)
    Monitor: LG W2242 (Digital) [22" LCD]
    Audio Adapter: Creative CA20K1 X-Fi Xtreme Fidelity Audio Processor
    Disk Drive: WDC WD360GD-00FLA2 (36 GB, 10000 RPM, SATA)
    Disk Drive: Maxtor 7B300S0 (300 GB, 7200 RPM, SATA)
    Disk Drive: ST3500320AS (500 GB, 7200 RPM, SATA-II)
    Optical Drive: LITE-ON DVDRW SOHW-1693S




    Setting I use for MCH @ 400MHz, (2.50A, 2.00B, 2.00D), TRD=8

    Setting I use for MCH @ 425MHz, (2.40B, 2.00B, 2.00D), TRD=10, FSB OverVoltage Control [+0.25V] (G)MCH OverVoltage Control [+0.25V]

    Setting I use for MCH @ 450MHz, (2.00B, 2.00D), TRD=12, CPU Clock Skew Control [50ps], GMCH Clock Skew Control [100ps], FSB OverVoltage Control [+0.25V], (G)MCH OverVoltage Control [+0.30V]


    Robust Graphics Booster___________ [Turbo]
    CPU Clock Ratio ____________ [8]
    Fine Clock Ratio ____________[0.5]
    CPU Host Clock Control_ [Enabled]
    CPU Host Frequency (MHz)__________ [400]
    PCI Express Frequency (Mhz)_______ [100]
    C.I.A. 2__________________________ [Disabled]
    System Memory Multiplier (SPD)____ [2.50A]
    DRAM Timing Selectable_______ SPD __ [Manual]

    Performance Enhance = [Standard]

    CAS Latency Time________________ 5
    Dram RAS# to CAS# Delay_________ 5
    Dram RAS# Precharge Delay_______5
    Precharge Delay (tRAS)__________ 15

    ACT to ACT Delay (tRRD)_________ Auto
    Rank Write to READ Delay________ Auto
    Write to Precharge Delay_________ Auto
    Refresh to ACT Delay______________ Auto
    Read to Precharge Delay__________ Auto
    Static tRead Value_______________ 8
    Static tRead Phase Adjust________ [Auto]

    CPU/PCIEX Clock Driving Control [800mV]
    CPU Clock Skew Control [normal]
    GMCH Clock Skew Control [Normal]

    System Voltage Control____ [Manual]
    DDR2 OverVoltage Control__ [+0.300V]
    PCI-E OverVoltage Control_ [+0.0V]
    FSB OverVoltage Control___ [+0.20V]
    (G)MCH OverVoltage Control [+0.25V]
    CPU Voltage Control_______ [1.275]

    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] Enabled if you use Vmware/Virtual PC

    Integrated Peripherals
    Legacy USB Storage Detect___________________[Disabled] *Note* Must be enabled to flash from USB

  8. #8
    Lsdmeasap's Avatar
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    Default Re: FSB Overvoltage Control, is this setting VTT ?

    Ya, I would not use Vcore 1.5 and 1.3 Vtt, nor should you need to. Sounds like you have something else holding you back but with 8GB and a quad I am not sure

    I do think you are holding back on the Vcore when you should for sure be adding more of that before you raise Vtt so high

    Try this and see if you get along any better for 400-450 (I suggest NO Skew adjustments for now) >>>

    Robust Graphics Booster___________ [Auto or Fast] << To rule out Turbo as a issue
    CPU Clock Ratio ____________ [8]
    Fine Clock Ratio ____________[0.5]
    CPU Host Clock Control_ [Enabled]
    CPU Host Frequency (MHz)__________ [401-450]
    PCI Express Frequency (Mhz)_______ [100]
    C.I.A. 2__________________________ [Disabled]
    System Memory Multiplier (SPD)____ [2.00B or D] << Do this now to rule out the ram as a issue, You would need massive voltages to keep 8GB of rm stable at 1000+ (I do not suggest using the A multi's at all, stick to B, or D << More stable at 400+ FSB)

    DRAM Timing Selectable_______ SPD __ [Manual]

    Performance Enhance = [Standard]

    CAS Latency Time________________ 5
    Dram RAS# to CAS# Delay_________ 5
    Dram RAS# Precharge Delay_______5
    Precharge Delay (tRAS)__________ 15

    ACT to ACT Delay (tRRD)_________ 3-5
    Rank Write to READ Delay________ 4-8
    Write to Precharge Delay_________ 6-12
    Refresh to ACT Delay______________ 54-68
    Read to Precharge Delay__________ 4-6
    Static tRead Value_______________ 7/8-10
    Static tRead Phase Adjust________ [Auto]

    CPU/PCIEX Clock Driving Control [800mV]
    CPU Clock Skew Control [Auto]
    GMCH Clock Skew Control [Auto]

    System Voltage Control____ [Manual]
    DDR2 OverVoltage Control__ [+0.300V] << For 8GB you normally need a bit more then rated spec's so try .35 if you have it

    PCI-E OverVoltage Control_ [+0.0V] << Set +0.1 for stability
    FSB OverVoltage Control___ [+0.20V] << I suggest you start with +0.15, then 0.15 if you have it. Then if all else fails again go back to .2
    (G)MCH OverVoltage Control [+0.25V] << 8GB May need more, have you tried .3-.35 with less FSB Above yet? And of course all your voltage thoughts may be null once you add more Vcore, which it looks like you have not been trying, you should

    CPU Voltage Control_______ [1.275] << Keep in mind, what you set here is less in windows at idle, and less then that at load. Set high to get going then lower later. When you go to raise this use Way less Vtt then you thought you had to use before. I would suggest you start with somewhere around 1.3-1.34 Actual Voltage shown in CPU-z, so you may need to set 1.36-1.415 in the BIOS to get that

  9. #9
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    Default Re: FSB Overvoltage Control, is this setting VTT ?

    I think it is maybe the motherboard (could be a dud that acts weird), or maybe in combo with the G-Skill RAM that I believe is powerchip.

    One thing I know for sure, there was issues with this motherboard and RAM over stock speeds when first release.

    I need Skew adjustment for speed over 450FSB or is does not post.

    I pumped the Vcore to 1.425v bios, and had limited luck. I was able to decrease the FSB voltage slightly, so that holds ture.

    Problem now is I cannot use the setting you gave me effectively. I find even if I increase the timings to max of each setting I still have issues with stablility or OCCT failing.

    Tried MCH at as high as +0.40v and that results in reboots. I feel +0.35v to close for comfort to be stable.

    At the moment I have done what I never do and never like doing.
    Running the CPU at stock 333 FSB and divider of 3.00A and TRD=5. The machine appears very stable, the RAM is at 1000 MHz, and I have the CPU at 1.075v in the bios, which results in very cool temps and lower power usage.

    If there is anything else I can do please let me know.

    450 FSB, I believe is out of the question, it is to unstable.

    425 FSB, I flakely and need the use of aleast TRD=10

    400 FSB, I really would like just 400 FSB if possible, at least I could have 3400 MHz and run the board at its rated speed. Any other suggestions to obtain this?


    btw. Thank you for all your help.
    Last edited by L33; 04-18-2009 at 02:38 PM.

  10. #10
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    Default Re: FSB Overvoltage Control, is this setting VTT ?

    One thing i can tell you, it's not the RAM. Powerchip makes ICs that go really high on low voltage, i've had some.

    Another thing i know is that +0.3v MCH makes the board act funny at first, but it will work well after you run it for some time at +0.2 and up to +0.3 if needed. I don't really believe in burn-in but it has happened to me. With +0.3v the chipset of my P35-DS3 runs at 46C, and i have an older chipset made with 90nm architecture not 65nm, so yours will be cooler. Thus you can rule out the heat factor, a fan for the northbridge is not needed.

    I do not like seeing any settings on Auto, so try the following for memory timings:

    CAS Latency Time________________ 5
    Dram RAS# to CAS# Delay_________ 5
    Dram RAS# Precharge Delay_______5
    Precharge Delay (tRAS)__________ 18 <- can be the difference between bootable and unbootable with Powerchip memory running at high frequencies

    ACT to ACT Delay (tRRD)_________ 3
    Rank Write to READ Delay________ 3
    Write to Precharge Delay_________ 6
    Refresh to ACT Delay______________ 62
    Read to Precharge Delay__________ 3
    Static tRead Value_______________ 9
    Static tRead Phase Adjust________ Auto or 0

    DDR2 OverVoltage Control__ +0.2v <- Powerchip isn't Micron. They don't need high voltage to run fast, actually too much will make them run slower. I reached 1030MHz with 2.0v when i had my Powerchip-based PQI memory, and they were rated at 800 with 1.8v.
    Pro hardware technician for PC, Laptop and Sound equipment.

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