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Thread: PCI Express Frequency




  1. #1
    Join Date
    Aug 2008
    Posts
    10

    Default PCI Express Frequency

    I just noticed that there seems to be a recommendation here for setting the PCI Express Frequency to 100 MHz. Is this for stability?

    I have EP45-DS3L with E7200, Corsair 2x1GB (4-4-4-12, 2.1V) and 9600GT.

    The system is stable except an occasional problem booting into Vista Ultimate where I usually get beyond the login screen and find a message from Windows that there has been a problem (OneCare stopped or HP printer drivers needed update) followed by a BSOD and restart.

    As I am still loading things, I am not sure if the problem is with updates and new software or some HW issue. So I am keeping an eye on this forum for wisdom.

    The last episode was after an extended period in which the power had been removed from the system.

    Here are my current BIOS settings:

    MB Intelligent Tweaker(M.I.T.)
    Robust Graphics Booster ...............: Auto
    CPU Clock Ratio ..........................: 9 X
    Fine CPU Clock Ratio.....................: +0.5
    CPU Frequency ...........................: 2.53 GHz (266x9.5)
    Clock Chip Control
    Standard Clock Control
    CPU Host Clock Control..................: [Disabled]
    CPU Host Frequency (Mhz) ............: 400 Mhz
    PCI Express Frequency (Mhz) .........: [Auto]
    Advanced Clock Control [Press Enter]
    CPU Clock Drive...........................: 800mV
    PCI Express Clock Drive.................: 800mV
    CPU Clock Skew (ps)....................: 0ps
    MCH Clock Skew (ps)...................: 0ps
    DRAM Performance Control
    Performance Enhance...................: [Standard]
    Extreme Memory Profile....................:[Disabled]
    (G)MCH Frequency Latch...............: [Auto]
    System Memory Multiplier ..............: [Auto]
    Memory Frequency (Mhz) ..............: 800 800
    DRAM Timing Selectable ................: [Manual]
    Standard Timing Control
    CAS Latency Time........................: 5 4
    tRCD ...........................................: 5 4
    tRP..............................................: 5 4
    tRAS............................................: 15 12
    Advanced Timing Control [Press Enter]
    tRRD...........................................: 3 [Auto]
    tWTR..........................................: 3 [Auto]
    tWR............................................: 6 [Auto]
    tRFC...........................................: 52 [Auto]
    tRTP...........................................: 3 [Auto]
    Command Rate (CMD) .............: 0 [Auto]
    Channel A
    Static tRead Value.........................: 5 [Auto]
    tRD Phase0 Adjustment...................: 0 [Auto]
    tRD Phase1 Adjustment...................: 0 [Auto]
    tRD Phase2 Adjustment .................: 0 [Auto]
    tRD Phase3 Adjustment..................: 0 [Auto]
    Trd2rd(Different Rank)....................: 6 [Auto]
    Twr2wr(Different Rank)...................: 6 [Auto]
    Twr2rd(Different Rank)...................: 5 [Auto]
    Trd2wr(Same/Diff Rank)..................: 8 [Auto]
    Dimm1 Clock Skew Control...............: [Auto]
    Dimm2 Clock Skew Control...............: [Auto]
    Channel B
    Static tRead Value.........................: 5 [Auto]
    tRD Phase0 Adjustment...................: 0 [Auto]
    tRD Phase1 Adjustment...................: 0 [Auto]
    tRD Phase2 Adjustment .................: 0 [Auto]
    tRD Phase3 Adjustment..................: 0 [Auto]
    Trd2rd(Different Rank)....................: 6 [Auto]
    Twr2wr(Different Rank)...................: 6 [Auto]
    Twr2rd(Different Rank)...................: 5 [Auto]
    Trd2wr(Same/Diff Rank)..................: 8 [Auto]
    Dimm1 Clock Skew Control...............: [Auto]
    Dimm2 Clock Skew Control...............: [Auto]

    Motherboard Voltage Control
    Voltage Type.………... Manual
    CPU
    CPU Vcore….……….........................: 1.25000v [Auto]
    CPU Termination…..... 1.200V*.......: [Auto]
    CPU PLL…………………....1.550V*.......: [Auto]
    CPU Referen.…………....0.805V*.......: [Auto]
    MCH/ICH
    MCH Core…………….....1.100V...........: [Auto]
    MCH Reference….…….0.760V...........; [Auto]
    ICH I/O……………….....1.550V............: [Auto]
    DRAM
    DRAM Voltage ……....1.800V............: 2.100V

    Advanced Settings
    Limit CPUID Max. to 3.....................: [Disabled]
    No-Execute Memory Protect............: [Enabled]
    CPU Enhanced Halt (C1E)................: [Enabled]
    C2/C2E State Support....................: [Disabled]
    x C4/C4E State Support..................: [Disabled]
    CPU Thermal Monitor 2(TM2) ...........: [Enabled]
    CPU EIST Function.........................: [Enabled]
    Integrated Peripherals
    SATA AHCI Mode………………………………: Disabled
    SATA Port 0-3 Native Mode………………: Enabled
    USB Controller………………………………….: Enabled
    USB 2.0 Controller…………………………….: Enabled
    USB Keyboard…………………………………..: Enabled
    USB Mouse……………………………………….: Enabled
    Legacy USB storage detect…………………: Disabled
    Azalia Codec………………………………………: Auto
    Onboard H/W LAN……………………………: Enabled
    Green LAN………………………………………..: Disabled
    SMART LAN……………………………………….: [Press Enter]
    Onboard LAN Boot ROM……………………: Disabled
    Onboard IDE Controller…………………….: Enabled
    Serial Port…………………………………………: 3F8/IRQ4
    Parallel Port………………………………………: 378/IRQ7
    Parallel Port Mode……………………………: SPP
    xECP Mode Use DMA…………………………: 3
    Power Management Setup
    ACPI Suspend Type……………………………: S3
    USB Device Wake Up From S3……………: Disabled
    Soft-off……………………………………………..: Instant off
    PME Event Wake Up………………………….: Enabled
    Power On By Ring………………………………: Enabled
    Resume by Alarm………………………………: Disabled
    HPET Support…………………………………….: Enabled
    HPET Mode………………………………….…….: 32-bit mode
    Power on by Mouse…………………………..: Disabled
    Power on by Keyboard………………………: Disabled
    KB Power on Password……………………..: [Enter]
    AC Back Function………………………………: [Soft off]

  2. #2

    Default Re: PCI Express Frequency

    Since you are not overclocking (yet) you should not getting any BSOD at all.
    Yes, keep PCIE frequency all the way at 100MHz - that channel are used by video card and harddisk controller so that way, you will not corrupt any file.
    Did you checked with MemTest86+ if you Corsair are running flat? That DDR2 memory is not the first choice for Gigabyte MoBos.
    Being not really a problem and looking at your Bios profile, the E7200 CPU Vcore is high for stock clock - it should be at 1.0875V - what BIOS are you using? Check if your CPU (E7200) are granted by your BIOS.
    GA-Z97-D3H Windows Pro 8.1
    i5-4690K + Corsair H90
    Sapphire Radeon R7 240
    16GB (2x8GB) DDR3 Corsair Vengeance Pro 2400MHz PC3 19200
    Corsair CX750M
    Samsung SSD 840 EVO 500 GB

    Sharkoon VS-3V tower

  3. #3
    Lsdmeasap's Avatar
    Lsdmeasap is offline GIGABYTE Guru
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    Default Re: PCI Express Frequency

    Yeah, it is Mainly for those who overclock, but I ALWAYS say it just incase someone like you who is not overclocking today decides to tomorrow before they ask or make a post about it.

    If you do not manually set it at 100 or so, when you overclock the FSB the PCI Freq will also be overclocked if set to AUTO

    You should manually set your Static tRead Values to 7-10, 5 is way to low, and command rate manually set as 2 should get you more stable

  4. #4
    Join Date
    Aug 2008
    Posts
    10

    Default Re: PCI Express Frequency

    Thanks for taking the time to look at my BIOS and making your replies.

    The CPU Vcore value was a typo on my part. It is 1.0875.

    The Bios is F7 and Memtest runs with no errors. In fact the system is stable except for the initial boot issue which could be Vista problems AFAIK. I am very pleased with the performance in the most demanding application that I have: FSX.

    If I continue to have problems, I will consider changing the memory to a pair that people have had better success with.

    I made the recommended changes to PCI Express Frequency: 100 MHz, Command Rate: 2 and Static tRead Value (both channels): 7.

    Thanks again.

  5. #5
    Lsdmeasap's Avatar
    Lsdmeasap is offline GIGABYTE Guru
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    Default Re: PCI Express Frequency

    Glad to see you are stable.

    Yeah those errors could be related ONLY to the HP software or the (Crap-Sorry had to say it) OneCare

    Post back if you have any issues

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