TechSpot

Visiontek 4850/Motherboard problem

By midlorollin
Aug 26, 2008
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  1. Hi, i just built a new rig. I put in two Visiontek 4850s, on a Gigabyte MA790X board. The specs for the board state that the two slots are indeed both x16, however when i look in my catalyst settings it claims they are only at x8. Anything i run (gaming-wise) runs laggy, and falls apart of crashes after a short while. I flashed the BIOS and there doesn't seem to be any other things i can think of to remedy the situation.

    I run:
    AMD 9850 2.5Ghz
    Gigabyte GA MA790X-DS4
    8.0GB Corsair DDR2
    CrossfireX Visiontek 4850s
    Running Vista-64bit, and FedoraCore 9

    And this is the output i get in Catalyst Control

    Primary Adapter
    Graphics Card Manufacturer Built by ATI
    Graphics Chipset ATI Radeon HD 4800 Series
    Device ID 9442
    Vendor 1002

    Subsystem ID 0502
    Subsystem Vendor ID 1002

    Graphics Bus Capability PCI Express 2.0
    Maximum Bus Setting PCI Express 2.0 x8

    BIOS Version 011.003.000.000
    BIOS Part Number 113-B50102-103
    BIOS Date 2008/05/23

    Memory Size 512 MB
    Memory Type GDDR3

    Core Clock in MHz 625 MHz
    Memory Clock in MHz 993 MHz
    Total Memory Bandwidth in GByte/s 59 GByte/s


    Linked Adapter
    Graphics Card Manufacturer Built by ATI
    Graphics Chipset ATI Radeon HD 4800 Series
    Device ID 9442
    Vendor 1002

    Subsystem ID 0502
    Subsystem Vendor ID 1002

    Graphics Bus Capability PCI Express 2.0
    Maximum Bus Setting PCI Express 2.0 x8

    BIOS Version 011.003.000.000
    BIOS Part Number 113-B50102-103
    BIOS Date 2008/05/23

    Memory Size 512 MB
    Memory Type GDDR3

    Core Clock in MHz 625 MHz
    Memory Clock in MHz 993 MHz
    Total Memory Bandwidth in GByte/s 59 GByte/s


    Thanks for any help.
  2. CCT

    CCT TechSpot Evangelist Posts: 3,556

    The old adage 'RTFM' applies:

    "(The PCIE_16_1 slot supports x16; the PCIE_16_2 supports x8.
    The PCI Express x16 slots conform to PCI Express 2.0 standard.)", and

    "(Note 3) When the CrossFireXTM technology is enabled, the PCIE_16_1 slot will operate in x8 mode. If you are installing a single PCI Express x16 graphics card, please install it in the PCIE_16_1 slot for optimum performance."


    Using 2 cards they have to default to the lower x8 setting.
  3. midlorollin

    midlorollin Newcomer, in training Topic Starter

    why would one be x8 though? the motherboard specifications state that both pci-e slots are x16.
  4. CCT

    CCT TechSpot Evangelist Posts: 3,556

    That would be a question to ask the Gigabyte people, not me.

    :)
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