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Thread: 790X-UD4P PCI-E Problem




  1. #1
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    Default 790X-UD4P PCI-E Problem

    I have a 790X-UD4P board paired with a 955 BE. I had a HD 4890 video card installed originally, and recently took it out because I'm planning to purchase a HD 5800 series card. In the meantime I had installed a HD 3850 which I keep for backup purposes.

    Not too long after I noticed a very laggy desktop performance and upon inspection I learned the card was operating at x1 bandwidth, instead of x16. I flahsed BIOS from F4 to F8, and it didn't fix it. Re-installing the HD 4890 and rolling back the BIOS didn't do anything, either.

    I am pretty confident that this has got to do with the Realtek NIC, because 1) it's also rooted in north bridge, and 2) I got x4 bandwidth when I connected the network cable. (Yes, the x1 bandwidth I got above was without network)

    I'd like to know if there is a fix for this or if my board is faulty. Thank you for your help.

  2. #2
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    Default Re: 790X-UD4P PCI-E Problem

    Is the card in the PCIEX 16 or PCIEX 8 slot?
    Also the onboard NIC will not affect the performance of a graphics card.

  3. #3
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    Default Re: 790X-UD4P PCI-E Problem

    It's in the x16 slot. As a matter of fact, I did try putting it in the 2nd slot and it worked at.. wait for it, x2 bandwidth.

    I've heard of issues like this before but never thought I'd encounter one.

    Performance isn't exactly issue here (well, although the end result is), and I suspect there is a problem with internal PCIe switch. I'd like to know if there is a workaround/fix or if my board is gone south. I am not a total noob when it comes to building computers and I'd like to waste the least amount of time possible so hopefully Gigabyte can answer it so that I can move on.
    Last edited by Bookmarkthis; 11-14-2009 at 12:41 AM.

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    Default Re: 790X-UD4P PCI-E Problem

    Bump. Please help. I thought this place was semi-officially monitored by Gigabyte?

  5. #5
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    Default Re: 790X-UD4P PCI-E Problem

    Bump again. My board is still under store warranty so I can return and get a replacement from them. I just want to avoid downtime if there is a workaround. Thank you.

  6. #6
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    Default Re: 790X-UD4P PCI-E Problem

    The NIC may be on a a seperate PCIE bridge connector. The NB is only capable of supplying a certain number of lanes. The slack is taken up by stand alone bridges in most cases.

    What are you using to read bandwidth/link speed? GPU-Z is probably the most reliable thing to use.

    The first thing I would try is to completely remove the ATI drivers. Use the uninstall utility first, then google search for the method to remove anything left behind. At times, registry entries and even files are left after install that can disrupt things. After following the cleaning steps, scan the registry with CCleaner, then re-boot before you install Catalyst 9.10

    Even though you've already flashed the BIOS, I would Clear the CMOS and then double check all board settings like making sure the First Boot Display Device is set to PEG and PCIE frequency is at 100. If there is a Graphics Booster entry, try Fast, Turbo and disabled (or what ever the settings are).

    Also check out the actual slots. Make sure all pins look good, and that the card contacts are clean too. Make sure the PCIE power connector is sound etc.

    If all this fails then you may beed to RMA. Contact gigabyte directly first though to see if their tech support has a solution. this is a community forum and nobody from Gigabyte posts here, so they may know something we have missed.
    Coolermaster CM 690 II advance Case
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    Intel X25-M Boot Drive (OS and Programs) 200MB/s Read & 90MB/s Write
    Corsair X32 200MB/s Read & 100MB/s Write
    WD Caviar Blue 640GB C (Steam, Games, Storage, Temp Files & Folders, etc)
    Samsung F3 500GB Backup/Images
    Noctua 1300RPM 19dB case fan (rear extraction)
    3 x 140 MM Coolermaster LED fans (one front intake, one top extraction, one side intake)
    Dell Ultra Sharp 2209WAf E-IPS @ 1680x1050

  7. #7
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    Default Re: 790X-UD4P PCI-E Problem

    Thank you for your suggestions. I already tried a backup image (clean install of Windows 7) on a different HDD, but the issue didn't disappear. I really don't think it is a software issue since I've tried two different video cards as well as clean OS. There are other things I've tried, but I'm sure you get the idea.

    All the low-level diagnostic tools reported same. Including, but not limited to, Everest, CPU-Z, GPU-Z, and AMD Overdrive.

    I've seen a Biostar employee helping with a similar issue on a different forum, and the troubleshooting involved changing some priorities of PCIe in the BIOS. (I just vaguely remember because it was a long time ago and I didn't pay much attention) But my board doesn't expose anything other than basic boot order (PCI, PEG, PEG2) so I figured I'd ask here.

    I guess RMA is in order.

  8. #8
    stasio's Avatar
    stasio is online now GIGABYTE Elite
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    Default Re: 790X-UD4P PCI-E Problem

    Try with new BIOS F9a.
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  9. #9
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    Default Re: 790X-UD4P PCI-E Problem

    Also there may be hidden settings in your BIOS. Press [CTRL] + [F1} at the same time on the main menu. It may reveal PCI and PCIE IRQ settings.
    Coolermaster CM 690 II advance Case
    Corsair HX750 (CWT, 91%(80+ Gold rated @230V) single 62A 12V rail
    P55A-UD4 v2.0 @ F14
    Core i5 760 @ 20 x 201, 4.02GHz
    TRUE Black with a single Noctua NF-P12 pumping out 55 CFM @ 19db .
    2 x 2GB Mushkin Ridgeback (996902), @ 7-10-8-27, 2010-DDR, 1.66v
    2 x Gigabyte GTX 460 1024MB in SLI (Pre OC'd to 715MHz core and 1800MHz VRAM) @ 850 Core / 4100 Mem.
    Intel X25-M Boot Drive (OS and Programs) 200MB/s Read & 90MB/s Write
    Corsair X32 200MB/s Read & 100MB/s Write
    WD Caviar Blue 640GB C (Steam, Games, Storage, Temp Files & Folders, etc)
    Samsung F3 500GB Backup/Images
    Noctua 1300RPM 19dB case fan (rear extraction)
    3 x 140 MM Coolermaster LED fans (one front intake, one top extraction, one side intake)
    Dell Ultra Sharp 2209WAf E-IPS @ 1680x1050

  10. #10
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    Lsdmeasap is offline GIGABYTE Guru
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    Default Re: 790X-UD4P PCI-E Problem

    I know you say the amount changed with or without a network cable installed, but can you please test both cards on another system to be sure they both operate at the full correct speeds?

    I have seen this a lot, and normally it is bad PCB on the cards

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