official Kepler BIOS Tweaker is a utility for editing the BIOS of NVIDIA Kepler graphics cards. Understands up to NVIDIA GTX Titan graphics cards. It gives you a wide access to the BIOS settings of your graphics card.
Be careful when using this utility! And don't forget to save the original BIOS file. In the archive there is a utility together with NVFlash for BIOS flashing.