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Thread: Z77X-UP7 Motherboard does not detect 2 of 4 Gigabyte 7970 HD GPU's

  1. #1
    Join Date
    May 2013
    San Diego, CA USA

    Default Z77X-UP7 Motherboard does not detect 2 of 4 Gigabyte 7970 HD GPU's

    I have an issue with a new build. Two of the GPU's are not detected by the device manager, and I suspect not POST'ing. If anyone knows how to display GPU Posting in the Bios or elsehwere, I'd love to know. Either way, I have four GPU's on this motherboard and only two are functional, and they aren't the first two orange slots, as the AMD catalyst control center detects multiple GPU's, but cannot crossfire even with the cables in.

    My configuration has adequate power, tested good by a thermaltake ATX power tester and is as follows:

    Mobo: Gigabyte Z77X-UP7 Bios version F5
    CPU 3770K Intel (stock speed)
    GPU's Four Gigabyte HG 7970 GE (stock speeds)
    PSU EVGA Classified Supernova 1500W PSU
    Storage: Samsung 840 Pro 256 Gb
    RAM: Team 8gb (2x4Gb)
    Monitor: Asus PA248

    Everything is seated correctly and powers on in the case (lights blink fans whir) but I cannot figure out why the other GPU's are not operating. Is there a software configuration I am missing? A BIOS setting for PCIe configuration?

    The advertisement is for 4-way CF/SLI, but there's nothing in the manual that's any help.

  2. #2
    Join Date
    Aug 2009
    Birmingham,Great Britain

    Default Re: Z77X-UP7 Motherboard does not detect 2 of 4 Gigabyte 7970 HD GPU's

    can you try with latest f6c beta bios

    you can always flash back to previous bios if it doesn't fix things
    Gigabyte z77x UP4-TH F11c Modded Bios
    Intel i7 3770k 24/7@4.8ghz 1.38v Turbo llc +0.165v dvid multithreading enabled
    Samsung Green(MV-3V4G3D/US) 8GB @2133mhz 9-10-10-21-1t 1.55v
    Thermalright Silver Arrow Cpu Cooler
    1xSamsung 840 pro 256 Gb SSD windows 8.1 pro 64bit
    1xSamsung f4 HD204UI 2tb hard drive Storage
    Powercolor 7970 3gb V3 @1150mhz core/1700mhz mem,1.150v Accelero aftermarket air cooler 55c max
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    Xfx Pro 750w silver rated Psu 80+
    Fractal Arc Midi Case x58 ud5 <=3.8ghz + 4.2ghz Overclock Template!! Visit Me On Youtube

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  3. #3
    Join Date
    Dec 2010
    Near Toronto but not in it

    Default Re: Z77X-UP7 Motherboard does not detect 2 of 4 Gigabyte 7970 HD GPU's

    and if you swap the two non-working GPU's with the two working units what happens? that would isolate the GPU's and the MB.

    and don't rule out the PSU if it's new... I've had a few not work right out of the box.

    Main Rig
    OS = Win8.1
    CPU = i7-980X @ 4.17Ghz 144x29 cooled by custom Loop
    Mem = 12GB 2000Mhz corsair Dominator GT at 2010Mhz @ 9-10-9-27-2T
    MB = Gigabyte GA-X58A-UD5 v1.0 with F6 Bios - Dead Board
    MB = EVGA X58 Classified3 e770
    GPU = 2x Sapphire r9 290x in xfire
    HD = 4x PNY 120GB Raid 0
    Storage = 2TB WD Black
    PSU = EVGA SuperNOVA 1300w
    Case = Cooler Master HAF-X 945

    HTPC / Home Server
    OS = Win7 64Bit running XBMC HTPC Front end with Windows Server 2011 Virtual Machine with 8GB ram assigned for homer server with exchange
    CPU = AMD 1090T
    Mem = 16GB 1600Mhz Kingston RED Limited Edition running at 1600Mhz
    MB = Gigabyte 790FXTA-UD5
    GPU- EVGA GT210
    HD = too many to count, but about 5TB of storage all together including backup
    PSU = Corsair TX750
    Case = Too embarrassed to mention.

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