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Thread: x99 ud4 - sli with ATX4P no boot, without boots fine




  1. #1
    crookeddeebz is offline Junior Member
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    Default x99 ud4 - sli with ATX4P no boot, without boots fine

    Hello, Just got a 2nd gpu for sli. Rig was flying with a single gpu.

    My motherboard wont boot when I have the ATX4P installed for PCIE extra power (as per manual, says with 2+ gpu plug this in)

    First, this is silly as an x99 gen should even have molex. But luckily my evga g2 came with 1 molex style connector.

    Boots fine, havent done any testing or bench without the ATX4P. Either 1 card or two cards of course.

    Any suggestions?

    thank you


    spec:
    x99 ud4
    5820k @4.3
    4x4gb ddr4
    zotac 980 amp omega
    asus strix 980
    evga 750w g2 (gold)

    Things ive tried:
    - diff PSU slot
    - diff molex on the chain
    - 1 card, 2 card same issue
    - sli bridge, no sli bridge
    Last edited by crookeddeebz; 12-02-2015 at 08:13 PM.

  2. #2
    Join Date
    Dec 2010
    Location
    Near Toronto but not in it
    Posts
    624

    Default Re: x99 ud4 - sli with ATX4P no boot, without boots fine

    your power supply isn't big enough...

    go though this power supply calculator and it'll tell you how big you need.

    MSI Canada

    Vin
    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 = 2x Toshiba 120GB Raid 0 (580MB Read/140MB Write)
    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.

  3. #3
    crookeddeebz is offline Junior Member
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    Default Re: x99 ud4 - sli with ATX4P no boot, without boots fine

    doubtful, all calcs come to 650-700watt for my rig. im on a 750 gold. sli works with out the atx4p, but not with.

    however i did figure it out.

    Gigabyte actually made the molex slot so you can plug in either direction! im surprised i didnt bin the board

    a molex should only fit one way...however not in the x99-ud4 lol.

    checked the keying, and turned it around. Was problematic before as the h440 doesnt allow much viewage on bottom facing mobo bits.

    please close.

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