Sapphire 7950 not working with Z77 Extreme4 at GEN 3 Speeds

Discussion in 'Videocards - AMD Radeon' started by carli21, Dec 4, 2012.

  1. carli21

    carli21 New Member

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    Hello:

    I have a Sapphire 7950 paired with an ASRock Z77 Extreme4 (BIOS v2.7) and an i5-3570K. The problem that I have is the following:

    The card is only being detected if it’s working at PCIE Gen 2 speeds and it seizes to be detected at Gen 3 speeds.

    Here are some details:
    - The video card is connected to the PCIE2 port (which is a PCIE 3.0 x 16 slot, all other slots are of lower speed)
    - The video card will only be detected if the port is set to GEN1, GEN2 or AUTO in the North Bridge settings in the BIOS
    - If the card is set to GEN 3 it stops being detected
    - If the card is set to AUTO, when I run GPU-Z it detects it as running only at GEN2 speeds even with the rendering test.
    - All the components are new
    - All power connectors are connected to the card and I verified that it is seated correctly


    So here are my questions…
    -What can I do to get the card running at GEN3 speeds?
    -What tests can I do to determine which of the components is at fault?
    -Should I care about this? I know something is not right but I'm not sure if this is a big deal.


    Bellow are the complete system specs:
    Intel Core i5-3570K
    ASRock Z77 Extreme4
    _ BIOS V2.7 (v2.0, 2.2 and 2.5 also tested with same results)
    SAPPHIRE 100352-2L Radeon HD 7950 3GB 384-bit GDDR5 PCI Express 3.0 x16
    _ GPU BIOS version: 015.023.000.001.000000
    _ Driver Ver: Catalyst 12.11 (12.10 also tested, same results)
    CORSAIR Vengeance 16GB (2 x 8GB) DDR3 1600
    CORSAIR Builder Series CX600 600W ATX12V
    Corsair CWCH60 Hydro Series H60 High Performance Liquid CPU Cooler
    OCZ Vengeance SSD
    LG BD-RE SATA (WH14NS40)
    Windows 7 Pro 64-Bit

    Other Similar Case:
    http://forums.*********.com/asrock/48876-asrock-z77-pro3-sapphire-hd-7850-oc-pci-e-3-0-slot-problem-no-signal-output.html
     
  2. BABA-The Hacker

    BABA-The Hacker Banned

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    motherboard...and GPU card firmwares up-to-date?

    Yes..MB updated....
     
  3. BABA-The Hacker

    BABA-The Hacker Banned

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  4. carli21

    carli21 New Member

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    Hello, Thanks for the reply.

    As far as I know I have the latest GPU firmware. I submitted a ticket to sapphire and I'll know if there is a new one. The website does not mention anything.

    I'll try and do some in-game tests to see if I can get the GPU-Z to read x16 speeds but as of now with the rendering tests it's @ 1.1 on idle 2.0 under load.
     

  5. carli21

    carli21 New Member

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    UPDATE:

    I just tested an XFX Radeon R7770 on the same port (and system) as I was testing my Sapphire 7950 and it is working at GEN 3 speeds (PCIE 3x16).

    I ran 2 tests:

    1. Set the BIOS to GEN3 and the card is detected with no issues
    2. Set the BIOS to AUTO and run GPU-Z and it is also detected as PCIE3x16.


    I'm currently in talks with Sapphire. Besides the 9750 being broken are there any other issues that I might be missing??
     

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