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Thread: PCIe X16 unstable on P55-UD2 - what do I lose using X4 slot?




  1. #1
    Join Date
    Dec 2009
    Location
    Hanover, PA
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    1

    Default PCIe X16 unstable on P55-UD2 - what do I lose using X4 slot?

    I recently built a machine with a Gigabyte GA-p55-UD2 motherboard, a Gigabyte 9600GT video card and a core i7-860 processor. When I tired to install Windows 7, the machine froze after the reboot where the video driver is installed. I could not install windows 7 at all. I tried Vista and that went well since Vista does not install a video driver during the installation. But after I installed the driver, the system froze. So I assumed the video card was bad and sent it to Gigabyte for repair. Meanwhile, I installed Windows 7 using an old video card.

    Gigabyte said the card was fine and sent it back. I tied it again in the already installed OS and it failed. I then tried a Radeon card and it would work for a while and then blue screen. So I assumed now that it was a MB problem. (The memory checked out with Memtest.)

    On a whim, I put the 9600GT card in the PCIe-X4 slot and lo and behold, the system ran fine and has been stable for two weeks running two 24" monitors. My question is, what am I losing by using the X4 slot instead of the X16 slot. I am not a gamer but got the card to support two monitors. If I replace the MB with one with a working X16 slot would I notice any difference? I just hate to send the board back and be without a computer for two weeks. Are there likely to be any other problems in the future with this board?

  2. #2
    Join Date
    Aug 2009
    Location
    Birmingham,Great Britain
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    9,250

    Default Re: PCIe X16 unstable on P55-UD2 - what do I lose using X4 slot?

    are you using the latest bios? as it might fix the problem check on gigabyte website and here for the very latest beta bios and read on how to flash using q-flash dont use @bios as its unstable and will wreck your mb if it goes wrong q-flash is fine as its in dos
    Gigabyte z77x UP4-TH F11c Modded Bios
    Intel i7 3770k 24/7@4.8ghz 1.38v Turbo llc +0.165v dvid multithreading enabled
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    Thermalright Silver Arrow Cpu Cooler
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    Powercolor 7970 3gb V3 @1150mhz core/1700mhz mem,1.150v Accelero aftermarket air cooler 55c max
    Razer Lycosa Keyboard
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    L.G E2260V L.E.D 1920x1080 Monitor
    Xfx Pro 750w silver rated Psu 80+
    Fractal Arc Midi Case

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  3. #3
    Join Date
    Dec 2009
    Location
    Canada
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    Default Re: PCIe X16 unstable on P55-UD2 - what do I lose using X4 slot?

    I'm very sure that you would be bottlenecking your card quite a bit. Most cards are about at the limit of 8X 2.0, a.k.a 16X. But at 4X you would see a performance drop for sure, since it would only allow information to be sent two times less then for what it is designed for. Perhaps you can get that slot fixed instead?

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