1. Post #1
    Cjmax's Avatar
    June 2008
    1,749 Posts
    I normally work with motherboards that only have one PCI Express 2.0 X16 slot, but I am planning on SLI soon. So to do that I need a new motherboard, and so far I have come across ones which say "Expansion slots: PCI Express 2.0 X16 - 2(x16, x4). My question is what does 2(x16, x4) mean? Does the difference between x16 and x4 mean anything or is it a default for dual PCI Express 2.0 X16 motherboards?

  2. Post #2
    AgentBoomstick's Avatar
    August 2010
    2,723 Posts
    x4/x8/x16 etc is, in a nutshell, the speed of the slot. If you plan on using SLI, the minimum you would want to go is a motherboard that is capable of x16/x4 single GPU or x8/x8 dual GPU (IE it maximizes the performance when you are using one GPU, and stabilizes it when you add a card). x16/x16 is always nice, but after x8/x8 you stop seeing huge performance boosts. If you plan on doing SLI don't go for the x16/x4 motherboards, they are essentially designed for single GPU builds.

  3. Post #3
    Cjmax's Avatar
    June 2008
    1,749 Posts
    Thanks man. Do you have any good dual PCI Express 2.0 x16 motherboards to recommend me? (AMD AM3 DDR3 1333MHz)

    Edited:

    How's this?

    http://www.newegg.com/Product/Produc...82E16813186198

  4. Post #4
    AgentBoomstick's Avatar
    August 2010
    2,723 Posts
    I would spend a little more cash than that, to at least get a reliable motherboard. I currently have this one, and it's pretty nice.

  5. Post #5
    Gold Member
    Zerokateo's Avatar
    November 2011
    4,775 Posts
    This is probably one of the best AM3 socket boards you can buy AND it has 2 pci-e x16 and 1 pci-e x4.

    http://www.newegg.com/Product/Produc...82E16813157281

    Edited:

    Herp derp didnt even see boomsticks link till I posted my own, Lol at least we have the same taste in motherboards.
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  6. Post #6
    Cjmax's Avatar
    June 2008
    1,749 Posts
    I appreciate the help. I'll probably go for that board after saving up a bit more.
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  7. Post #7

    May 2011
    209 Posts
    I have the Gigabyte GA-990FX-UD3, http://www.gigabyte.com/products/pro...x?pid=3894#ov; its a great board and it does 16x/16x. I have 2 HD 6950's in it at the moment and it works great