ASUS SABERTOOTH Z77 vs ASUS P8Z77 WS (PCIe 3.0 questions)

I was wondering which one would be the better motherboard option. I will be using an SLI configuration (possibly 2x GTX 690s, yes 690s, not 680s). The Sabertooth has PCI Express 3.0 Slots (2 at x8 each) and the P8Z77 WS has PCI Express 3.0 Slots (2 at x16 each).

I keep hearing everywhere that the new Ivy Bridge processor will only accept 16 lanes of PCI Express, so the x8 x8 configuration would already cap out the IB processor. Is this true?

In addition, if I add a sound card to the PCI Express x1 slot would this affect performance in anyway (as in will it cap at x1 and therefore bottleneck my GPU performance due to lane limitations)? This really threw me off and I'm not sure what's right anymore.

Lastly, I hear this is a super minor performance (almost non existent) hit against PCI Express 3.0 x8 vs PCI Express 3.0 x16, since current GPU's do not need that much bandwith. Is this true as well?

All this is kinda confusing I would appreciate some help.

Motherboards in question:
http://www.newegg.com/Product/Product.aspx?Item=N82E16813131822
http://www.newegg.com/Product/Product.aspx?Item=N82E16813131821
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  1. McSaggler said:
    I was wondering which one would be the better motherboard option. I will be using an SLI configuration (possibly 2x GTX 690s, yes 690s, not 680s). The Sabertooth has PCI Express 3.0 Slots (2 at x8 each) and the P8Z77 WS has PCI Express 3.0 Slots (2 at x16 each).

    I keep hearing everywhere that the new Ivy Bridge processor will only accept 16 lanes of PCI Express, so the x8 x8 configuration would already cap out the IB processor. Is this true?

    In addition, if I add a sound card to the PCI Express x1 slot would this affect performance in anyway (as in will it cap at x1 and therefore bottleneck my GPU performance due to lane limitations)? This really threw me off and I'm not sure what's right anymore.

    Lastly, I hear this is a super minor performance (almost non existent) hit against PCI Express 3.0 x8 vs PCI Express 3.0 x16, since current GPU's do not need that much bandwith. Is this true as well?

    All this is kinda confusing I would appreciate some help.

    Motherboards in question:
    http://www.newegg.com/Product/Product.aspx?Item=N82E16813131822
    http://www.newegg.com/Product/Product.aspx?Item=N82E16813131821


    Hi I have 2gtx 680 on 2 pcie2.0 slots running at 8x. Everything is ok and sometimes the gpu run less, for example at 80%.
    If the pcie2.0 bottlenecks a 680 at 8x so will slightly the pcie 3.0 at 8x with a 690 card.

    It's just my opinion, I will buy a ws mobo, and was planning to step up with evga to 2 690 :).

    I have a 2600k sandy bridge cpu, I know it doesnt run with pcie3.0 at least I use the pcie 2 at 16.0. Don't know about the ivy bridge. I wasn't expecting a similar limit on it
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