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Thread: SLI/CrossFire certified requeriments

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    Default SLI/CrossFire certified requeriments

    Could someone tell me how many PCIe connectors and Amperage (+12V combined) is needed for a certified:

    X1800/X1900 Series CrossFire
    7800/7900 Series SLI
    7950GX2 QuadSLI
    8800GTX SLI


    Many thanks

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    X1900 Crossfire certification has a 38A requirement. Two PCI-e connectors.

    7950GX2 Quad SLI is 50A, I believe. Two PCI-e connectors.

    8800GTX is 60A. Four PCI-e connectors.

    Can't remember 7800 or 7900. I think it's 40A.

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    If someone could confirm that... (and find 7800/7900 requeriments).

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    Nvidia has never really upgraded their info to include the 7950GX2 but all of the retailer specs i've seen have been between 35-38a (single cards were 27-28a...notice how it doesn't double). Specs for the other Nvidia cards are as follows:

    When building an SLI PC, NVIDIA recommends using an SLI-Ready certified power supply. Check here for the complete list of certified power supplies. As an additional recommendation, NVIDIA provides the following power supply guidelines for SLI PCs:

    Ultra High-End SLI PC*:
    You must have a power supply that can provide a minimum of +12V @ 22A of dedicated power for the two graphics cards. Of this 22A requirement, +12V @ 5.5A must be available to each of the two PCI Express 6-pin auxiliary power supply connectors. The remaining 11A must be supplied to the motherboard for dedicated graphics card use.

    High-End SLI PC*:
    Minimum of 500-600W Power Supply with a minimum of +12V @ 30A for all PC components.

    Mid-Range SLI PC*:
    Minimum of 450-500W Power Supply with a minimum of +12V @ 26A for all PC components.

    Low-End SLI PC*:
    Minimum of 400-450W Power Supply with a minimum of +12V @ 22A for all PC components.

    *Note: These power supply recommendations are based on the following test configurations using standard component clock speeds:

    Ultra High-End SLI PC Configuration:
    Dual GeForce 7900 GTX or Dual GeForce 7800 GTX 512MB
    AMD Athlon 64 FX-60 2.6 GHz or Intel Pentium EE 955 3.46 GHz
    NVIDIA nForce4 SLI X16 motherboard with 2GB system memory
    Two HDDs in Raid 0 configuration
    Two optical drives
    PCI Sound Card
    LCD at 1600x1200 resolution

    High-End SLI PC Configuration:
    Dual GeForce 7800 GTX 256MB or Dual GeForce 6800 Ultra
    AMD Athlon 64 FX-57 2.8 GHz or Intel Pentium EE 840 3.2 GHz
    NVIDIA nForce4 SLI X16 motherboard with 2GB system memory
    Two HDDs in Raid 0 configuration
    Two optical drives
    PCI sound card
    LCD at 1600x1200 resolution

    Mid-Range SLI PC Configuration:
    Dual GeForce 7900 GT or Dual GeForce 6800 GT or Dual GeForce 6800
    AMD Athlon 64 4000+
    NVIDIA nForce4 SLI motherboard with 1GB system memory
    Single HDD
    Two optical drives
    PCI sound card

    Entry-Level SLI PC Configuration:
    Dual GeForce 7600GT or Dual GeForce 6600 GT or Dual GeForce 6600
    AMD Athlon 64 4000+
    NVIDIA nForce4 SLI motherboard with 1GB system memory
    Single HDD
    One optical drive

    source: http://www.slizone.com/object/slizone_howtobuild_2.html
    Last edited by Makalu; 11-01-2006 at 07:37 PM.

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    38amps for xfire is the recommendation, however that should vary by card. For instance: the x1950xtx will draw more power than the x1950 pro xfire.
    34amps for SLi 7800 series cards is the recommendation and 28 amps for sli 7900gt's. 34amps for sli 7900gtx's. This is stock of course, and the oc'ed figures will be different. If you need those, I'm sure I could find something...
    ~Pe@ce~

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    Quote Originally Posted by krampak View Post
    If someone could confirm that... (and find 7800/7900 requeriments).
    Umm... Who are you expecting to step up and confirm that? An nVidia rep?

    Nvidia doesn't give these numbers out. Nvidia only gives you what Makalu pointed out. Very vague suggestions. But when it comes to what will pass or fail, you send the PSU to them, they look at the specs, confirm them with a load tester and then categorize the unit based on the power output of the +12V rail and the number of PCI-e connectors.

    Fortunately, ATI actually does give out 12V rail requirements for each level.

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    newegg includes amp requirements in their specs...
    OP, jonny is our resident PSU god, so uhh... listen to him!
    ~Pe@ce~

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    So you think this would be ok ?


    X1800/X1900 Crossfire - Two Pcie - 38A overall system
    7800GTX/7900GTX SLI - Two PCIe - 34A overall system
    7800GT/7900GT - Two PCIe - 28A overall system
    7950GX2 Quad SLI - Two PCIe - 50A overall system
    8800GTX - Four PCIe - 60A overall system

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