NiBiTor - nVidia BIOS Editor
NiBiTor (nVidia BIOS Editor) is a BIOS Info/Editor utility designed for all nVidia GeForce Graphic Cards. The tool has been designed to check the initial clock speeds of the nVidia BIOSes and also allows some modification of those. So with this tool you can already check your Original BIOS and see what a Updated version of it would make as simple changes to the card...
Ability to modify the several BIOS parameters
Core Clock defined within the BIOS
Memory Clock defined within the BIOS
Core Voltage defined within the BIOS
Memory Timings defined withing the BIOS