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Thread: Gigabyte BIOS Settings




  1. #1
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    Default Gigabyte BIOS Settings

    I need some explanation for the following BIOS settings:

    1) "Isochronous Support" Enable or Disable?
    2) "Bi Directional PROCHOT" As I understand it, this is some kind of temperature protection thing that should be left Enabled? How does it differ to TM?
    3) "Performance Enhance" (As found in Advanced Memory Settings). Options are 'Standard', 'Turbo' and 'Extreme'. What exactly does it do? Is it some kind of automatic memory overclocking? I have it at 'Standard' ATM.
    4) "DRAM Timing Selectable (SPD)" What's the difference between 'Quick' and 'Expert'?
    5) "eXtreme Hard Drive (XHD)" This is just Gigabytes automatic RAID gimmick? If I'm configuring my own RAID array via the intel BIOS menu (Ctrl+I), I should set eXtreme Hard Drive (XHD) to Disabled, and choose 'RAID' mode in "PCH SATA Control Mode"?
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  2. #2
    Lsdmeasap's Avatar
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    Default Re: Gigabyte BIOS Settings

    First two, unsure but you are right on #2

    For #3 this improves memory bandwidth, on older boards when overclocking Standard is best, on P55/X58/P67 Extreme is best to use.

    4. Expert you set each channel one by one, quick you only set one channel. Expert is suggested.

    XHD, yes leave that disabled and set RAID on the option below that

  3. #3
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    Default Re: Gigabyte BIOS Settings

    From my encounters with Isochronous, it describes a kind of Quality of Service measure. Basically anything that requires Isochronous transfer means that it requires data in response to its request within a certain time period. Enabling Isochronous support should mean that any data that is time critical and would mean a client machine/device action would be broken if not delivered on time, will be prioritized before other transfers. A bit like triage in a hospital or at an accident scene, where those in need of help the most are given treatment first, those that aren't time critical get seen after.

    Bi Directional PROCHOT is indeed similar to Intel TM control. Unlike TM where the Processor will signal the board to cut power if a set temp is reached and in some cases throttle speeds at high temps, Bi Directional PROCHOT allows a more sophisticated level of control. It also minimises the number of pins on a CPU that must be dedicated to thermal management by being able to send a more compact form of data compared to Intel's TM.

    LSD's definitions are also spot on.
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    Default Re: Gigabyte BIOS Settings

    Quote Originally Posted by Psycho101 View Post
    Bi Directional PROCHOT is indeed similar to Intel TM control. Unlike TM where the Processor will signal the board to cut power if a set temp is reached and in some cases throttle speeds at high temps, Bi Directional PROCHOT allows a more sophisticated level of control. It also minimises the number of pins on a CPU that must be dedicated to thermal management by being able to send a more compact form of data compared to Intel's TM.
    So do you still need TM if Bi Directional PROCHOT is enabled? Would the latter make the former redundant?

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    Default Re: Gigabyte BIOS Settings

    As far as I know, BDP is an extension of which ever throttling tech is used. For example AMD could also implement it and the BIOS would be programmed in such a way to make use of it in conjunction with AMD's monitoring signal.

    I'd definitely keep Intel TM enabled. This alone contains enough function to litterally save a CPU. BDP necessity is questionable. It doesn't however cost any performance and I haven't heard of any instabilty issues using it. That's why I also keep it enabled.
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    Default Re: Gigabyte BIOS Settings

    I agree, TM should for sure always be enabled just in case.

    BDP, I've never changed either, didn't think it would affect anything so I always leave it as is.

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    Default Re: Gigabyte BIOS Settings

    Quote Originally Posted by oubadah View Post
    I need some explanation for the following BIOS settings:

    1) "Isochronous Support" Enable or Disable?
    2) "Bi Directional PROCHOT" As I understand it, this is some kind of temperature protection thing that should be left Enabled? How does it differ to TM?
    3) "Performance Enhance" (As found in Advanced Memory Settings). Options are 'Standard', 'Turbo' and 'Extreme'. What exactly does it do? Is it some kind of automatic memory overclocking? I have it at 'Standard' ATM.
    4) "DRAM Timing Selectable (SPD)" What's the difference between 'Quick' and 'Expert'?
    5) "eXtreme Hard Drive (XHD)" This is just Gigabytes automatic RAID gimmick? If I'm configuring my own RAID array via the intel BIOS menu (Ctrl+I), I should set eXtreme Hard Drive (XHD) to Disabled, and choose 'RAID' mode in "PCH SATA Control Mode"?
    <!-- / message --><!-- message, attachments, sig -->
    I know this an is old thread, but I have the same question concerning item number 3. All of my Gigabyte motherboards are set to "turbo" by default. There is no documentation describing the various modes. Why isn't "standard" the default? Wouldn't that be more stable? I do not want to overclock memory. I haven't experienced any memory stability issues to my knowledge, but I'd like to know how "turbo" differs from "standard".

  8. #8
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    Default Re: Gigabyte BIOS Settings

    3) "Performance Enhance" (As found in Advanced Memory Settings). Options are 'Standard', 'Turbo' and 'Extreme'. What exactly does it do? Is it some kind of automatic memory overclocking? I have it at 'Standard' ATM.
    From the P35 and P45 mobo user manuals:
    Performance Enhance
    Allows the system to operate at three different performance levels.
    • Standard Lets the system operate at its basic performance level.
    • Turbo Lets the system operate at its good performance level. (Default)
    • Extreme Lets the system operate at its best performance level.
    The advice back then was to use Standard mode while you were overclocking and stress testing and to try Turbo mode after you reached your final overclock and then repeat your stress tests.

    I found that using Turbo or Extreme modes tightened some of the secondary memory timings, but Extreme mode was never stable for me. Using Turbo or Extreme modes had no effect on overclocking cpu or memory speed settings. There are several programs that will display the secondary memory timings including MemSet and Aida. Using Turbo mode resulted in an insignificant improvement in memory benchmark scores that were less than one half of 1%. Both of my overclocked P35 systems are running with 8GB of ddr2 memory with tight primary memory timings and Performance Enhance = Turbo.

    For best stability and performance, Optimized Bios defaults should be loaded first, followed by making any bios changes. This also applies to systems that are not overclocked.
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