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  1. #1
    ROG Guru: Brown Belt Array LiveOrDie PC Specs
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    GeForce GTX 680 Release Driver Limits PCI-Express to Gen 2.0 on X79/SNB-E Systems

    Users of systems running Core i7 processors in the LGA2011 package and X79 chipset motherboards will find that their GeForce GTX 680 will not run at PCI-Express 3.0 x16 mode, using launch drivers. This is because NVIDIA decided against implementing Gen 3.0 support for the new GPU on X79/SNB-E systems, at the very last moment. Pre-launch drivers, including the driver that ships on discs with the graphics cards, and review drivers (which cannot be distributed), will let the GPU run at Gen 3.0 mode on some X79/SNB-E systems, however the post-launch stable drivers (such as GeForce 301.10 WHQL), won't.

    The specifications page of GeForce GTX 680 on GeForce.com has been updated to mention this:
    Quote:
    GeForce GTX 680 supports PCI Express 3.0. The Intel X79/SNB-E PCI Express 2.0 platform is only currently supported up to 5GT/s (PCIE 2.0) bus speeds even though some motherboard manufacturers have enabled higher 8GT/s speeds.
    Sources in the PC motherboard industry we spoke with, confirmed this change. PCI-Express 3.0 x16, for now, might only run on upcoming "Ivy Bridge" Core systems, running on motherboards with PCI-Express 3.0 compliant components. NVIDIA could be working to fix the issue.
    http://www.techpowerup.com/forums/sh...d.php?t=162942


    So i brought this x79 board for my Gen 3 cards to run @ Gen 2 speeds great!

  2. #2
    ROG Guru: Grand Master Array HiVizMan's Avatar
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    Ah I love new graphic cards. But I do not love the new drivers.
    To help us help you - please provide as much information about your system and the problem as possible.

  3. #3
    ROG Guru: Brown Belt Array LiveOrDie PC Specs
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    Just means the X79 chip isn't real PCI-E 3.0

  4. #4
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    well there was an old driver that made it 3.0 for x79 but i think becos once oc bclk to 105 then the vga cannot handle so u bsod when entering os so then the new drivers forced it to gen 2 on x79

  5. #5
    ROG Guru: Grand Master Array HiVizMan's Avatar
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    I guess Intel is the only one who can tell us. My personal view is that we really do not have any Gen3 hardware to even test. I do not care what these VGA marketing muppets are trying to claim that their cards are Gen3 I have my doubts about that big time.
    To help us help you - please provide as much information about your system and the problem as possible.

  6. #6
    ROG Guru: Brown Belt Array LiveOrDie PC Specs
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    Quote Originally Posted by Shamino View Post
    well there was an old driver that made it 3.0 for x79 but i think becos once oc bclk to 105 then the vga cannot handle so u bsod when entering os so then the new drivers forced it to gen 2 on x79
    That really sucks will this be fixed in bios updates?

  7. #7
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    nope, no matter what u do at board side, if drivers say 3.0 then its 3.0, if drivers say 2.0 then its 2.0

  8. #8
    ROG Guru: Blue Belt Array mdzcpa PC Specs
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    This must be an Nvidia issue. My AMD 7970s run PCIe 3.0 fine on the RIVE and the P9X79 Deluxe.

  9. #9
    ROG Guru: White Belt Array Hyper's Avatar
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    Quote Originally Posted by LiveOrDie View Post
    Just means the X79 chip isn't real PCI-E 3.0
    I don't recall Intel ever stating the X79 chip was PCI-E 3.0


  10. #10
    ROG Guru: Brown Belt Array LiveOrDie PC Specs
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    Says here on Asus's Product page for the R4E.

    PCIe 3.0 Ready

    The latest PCI Express bus standard delivers imporved encoding for twice the performance of current PCIe 2.0. Total bandwidth for a x16 link reaches a maximum of 32GB/s, double the 16GB/s of PCIe 2.0 (in x16 mode). PCIe 3.0 provides users unprecedented data speeds combined with the convenience and seamless transition offered by complete backward compatibility with PCIe1.0 and PCIe 2.0 devices. It is a must-have feature PC users aiming to improve and optimize graphics performance, as well as have the latest, most future-proof technology.
    Nvidia has updated there driver info with this so the X79 chipset is only PCI-E 2.0 but can run at higher PCI-E 3.0 speeds.

    While X79/SNB-E is a native Gen2 platform, some motherboard manufacturers have enabled Gen3 speeds. With our GTX 680 launch drivers, we will only be supporting Gen2 speeds on X79/SNB-E while we work on validating X79/SNB-E at these faster speeds. Native Gen3 chipsets (like Ivy Bridge) will still run at full Gen3 speeds with our launch drivers.

    GeForce GTX 680 supports PCI Express 3.0. It operates properly within the SIG PCI Express Specification and has been validated on multiple upcoming PCI Express 3.0 platforms. Some motherboard manufacturers have released updated SBIOS to enable the Intel X79/SNB-E PCI Express 2.0 platform to run at up to 8GT/s bus speeds. NVIDIA is currently working to validate X79/SNB-E with GTX 680 at these speeds with the goal of enabling 8GT/s via a future software update. Until this validation is complete, the GTX 680 will operate at PCIE 2.0 speeds on X79/SNB-E-based motherboards with the latest web drivers.

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