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Thread: PCI ExpressFrequency

  1. #1
    Join Date
    Jul 2009

    Default PCI ExpressFrequency

    I have a GIGABYTE GA-EP45-UD3P mobo and I am running an E8500 @3.8 and everything is fine. I have noticed that it is recommended that the PCI Express Frequency should never be left on Auto. Is this correct? If so why?

  2. #2
    Join Date
    Mar 2009

    Default Re: PCI ExpressFrequency

    Set it to 100...Why? Cause I said to.. Actually I don't know why but that what everyone recommends.

  3. #3
    Chike is offline Senior Member
    Join Date
    Jun 2009

    Default Re: PCI ExpressFrequency

    LOL @ Conners.
    Yeah it's kind of a myth, from what I've seen so far (couple of months) I haven't seen the PCI-E frequency chnage as result of overclocking.

  4. #4
    Join Date
    Jul 2009

    Default Re: PCI ExpressFrequency

    Thank you. I've set it to 100. I have CPUID and the temp hasn't changed when I went from AUTO to 100. I set it to 100 because Conners said to.

  5. #5
    MadMax2911's Avatar
    MadMax2911 is offline Member
    Join Date
    Dec 2008
    Southern CA

    Default Re: PCI ExpressFrequency

    Thats what I set it to on all my gigabyte boards is PCI-E to [100] and Performance Enhance set to [standard] also you may want to [disable] USB Legacy storage detect in integrated periferals section. Except when you need to flash from USB of course.
    Max out
    Last edited by MadMax2911; 10-11-2009 at 11:43 PM. Reason: sp
    BUILD #2 GA-EP45-DS3R [Rev1.0] BIOS Flashed F11e, CPU=INTEL Core2 Quad Q8200 Yorkfield-4M LGA 775 with Mugen2 cooler RAM= Mushkin 996599 link 2 x 2GB, Hard drive=WD 6400AAKS, DVD=HP dvd1160i OS=Win 7 SP1 64 bit Video=BFG 8800GTS OC edition CASE=Thermaltake Tsunami Dream P.S.=Antec TP3-650

    Build #3 GA-EP45-UD3LR__rev 1.0__ BIOS F11, CPU Core2 Duo E8400 3.157GHz WMugen2 Cooler, Power Supply: Antec EA-500D 500 W, RAM: Corsair 2 GB Hard Drive: WD 160 GB OS: Win XP SP3 Video: MSI GTS450 2GB

  6. #6
    Join Date
    Apr 2009
    J'Habite En Angleterre

    Default Re: PCI ExpressFrequency

    It's both a legacy thing and to make sure on different BIOS and board revisions that the PCIe bus stays at stock 100MHz.

    Many a time on older boards, increasing the FSB by 1MHz when the PCIE was on auto also increased the PCIe frequency to 101MHz etc, so a 50MHz FSB OC would result in a PCIe frequency of 150MHz. This is not ideal and many mobos don't like to run the PCIe bus much past stock. There's no performance gain by OCing it either.

    Setting 100 guarantees that the bus is at 100MHz. Auto may have gotten sensible on your board and also lock the bus to 100, but it's easy and IMO more certain and problem free to set 100 in the first place.
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