GeForce GTX 680 and GTX 670 GPUs support PCI Express 3.0. They operate properly within the SIG PCI Express Specification and have been validated on multiple PCI Express 3.0 platforms. Some motherboard manufacturers have released an updated SBIOS to enable the Intel X79/SNB-E PCI Express 2.0 platform to run at up to 8GT/s bus speeds. We have tested GeForce GTX 680 and GTX 670 GPUs across a number of X79/SNB-E platforms at 8GT/s bus speeds, but have seen significant variation in signal timing across different motherboards and CPUs. Therefore we’ve decided to only support and guarantee PCI Express 2.0 bus speeds on X79/SNB-E with our standard release drivers. Native PCI Express 3.0 platforms (like Ivy Bridge) will run at 8GT/s bus speeds with our standard release drivers.
Though we cannot officially support or guarantee 8GT/s speeds for X79/SNB-E, you can manually enable faster 8GT/s bus speeds (at your own risk) on GTX 680 or GTX 670 GPUs using the following executable: force-enable-gen3.exe
If you would like to revert back to 5GT/s bus speeds you can do so by running the following command from the DOS command line: “force-enable-gen3.exe –revert”
You may download "force-enable-gen3.exe" from the File Attachments section below. You will need to reboot your system for the changes to take effect.
We have worked with many of the motherboard vendors and tuned parameters to support PCIe Gen3 by default on our new products. The list of products that have Gen3 support on X79 (IVB-E/SNB-E) chipset by default include the following:
GeForce GT 635
GeForce GT 640
GeForce GT 710
GeForce GT 720
GeForce GT 730
GeForce GTX Titan
GeForce GTX 780
GeForce GTX 780 Ti (IVB-E)
GeForce GTX Titan Black (IVB-E)
GeForce GTX Titan Z
GeForce GTX 690