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Thread: Z68X-UD7-B3 + 6990 crossfire possible ?




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    Default Z68X-UD7-B3 + 6990 crossfire possible ?

    I know it states support for up to 3 way SLI / Crossfire but does that apply to 6990 Crossfire (6990 x2) given that is technically Quad ?
    Last edited by saytr79; 06-12-2011 at 09:00 PM.

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    Acebmxer's Avatar
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    Default Re: Z68X-UD7-B3 + 6990 crossfire possible ?

    I do not think so since it is quad fire. Think the best you could do is 1 6990 and 1 6970.
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    Default Re: Z68X-UD7-B3 + 6990 crossfire possible ?

    So those cards cannot be installed on a non CrossFireX/SLI enabled board?
    Doesn't sound right to me.

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    Default Re: Z68X-UD7-B3 + 6990 crossfire possible ?

    Yeah I dont know how cards like the 6990 work in none crossfire/sli boards.
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    Default Re: Z68X-UD7-B3 + 6990 crossfire possible ?

    Like they should is my guess.
    I don't think it's consodered CF/SLI untill you have placed the bridge, there is nothing the board should be aware of.

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    Default Re: Z68X-UD7-B3 + 6990 crossfire possible ?

    Hrm, I could buy two and try it out...would be an expensive way to find out, heh.

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    Chike is offline Senior Member
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    Default Re: Z68X-UD7-B3 + 6990 crossfire possible ?

    You could also ask the card manufacturer directly.

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    Default Re: Z68X-UD7-B3 + 6990 crossfire possible ?

    A 6990 is no different to any other graphics card as far as a motherboard is concerned. All Crossfire workings are handled internally, it doesn't depend on the motherboard at all, and it doesn't need Crossfire certification.

    You can crossfire (Quadfire) two 6990's on any Crossfire compatible board. All you need is the requisite minimum of two full length PCIe slots. Plug them in, connect a Crossfire bridge and away you go.

    As far as the motherboard is concerned it's exactly the same as normal Crossfire with two single GPU cards.

    Quadfire = two dual GPU cards
    4-Way CrossfireX = four single GPU cards.

    You're only limited by the motherboard if you either don't have enough physical slots to plug in all your cards or if the board lacks Crossfire Certification. There are no seperate certifications for Crossfire types.
    Last edited by Psycho101; 06-12-2011 at 11:56 PM.
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    Default Re: Z68X-UD7-B3 + 6990 crossfire possible ?

    Quote Originally Posted by Psycho101 View Post
    A 6990 is no different to any other graphics card as far as a motherboard is concerned. All Crossfire workings are handled internally, it doesn't depend on the motherboard at all, and it doesn't need Crossfire certification.

    You can crossfire (Quadfire) two 6990's on any Crossfire compatible board. All you need is the requisite minimum of two full length PCIe slots. Plug them in, connect a Crossfire bridge and away you go.

    As far as the motherboard is concerned it's exactly the same as normal Crossfire with two single GPU cards.

    Quadfire = two dual GPU cards
    4-Way CrossfireX = four single GPU cards.

    You're only limited by the motherboard if you either don't have enough physical slots to plug in all your cards or if the board lacks Crossfire Certification. There are no seperate certifications for Crossfire types.
    Nice, i was hoping this was the case but wasn't 100% sure. Now all i need to do is find two 6990's for sale ..... or one for that matter, heh. Thanks.

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    Default Re: Z68X-UD7-B3 + 6990 crossfire possible ?

    They're quite hard to find here in the UK too. All my favorite online retailers are out of stock on an almost permanent basis, and when they do get stock, it's always of the most expensive brand. With a 6990, they're all reference so apart from warranty terms, any manufacturer will do. :)

    Acebmxer raises an interesting point though. For much less cash, you can go tri-fire with a 6990 and a 6970.This will probably net you ~85%+ of the performance of Quadfire, as Quadfire is where scaling really drops off. Even better, get a 6990 and a first edition reference 6950, flash the 6950 to a 6970 and get your TriFire that way. Depends on pricing of the 6970 in your country though.

    Note that all the way up to 2560x1600, TriFire would be ideal, but if running eyefinity, eg four monitors at 7680x1080 or even three at 5760x1080, Quadfire actually starts to offer closer to the magic 100% scaling over a single 6990.
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