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Also this thread What is it that you want to achieve?
/ Edit - These are what I used for my 780Ti NVFlash and Kepler BIOS Tweaker 1.27
I am wanting to get rid is turbo and have a set clock because that card just dose whatever it feels like.
playing games like BF4 i am hitting the power and voltage limit that is set by EVGA
In which case I would definitely check out the SkyNet BIOSs as they will do everything you are looking for. If they don't have one for your specific card I found that with my 780Ti they are interchangeable as long as you use the -4 -5 -6 switches with NVFlash. Your other option is to take a copy of your original BIOS (which you'll be doing anyway) and use the Kepler BIOS Editor to modify a copy of it in line with the changes made in the SkyNet BIOSs which you can use the Editor to check out.
If you're not confident with manually editing the BIOS then I can recommend Svet's VBIOS Tuner it is payware (15 Euro) but is a lot more intuitive and is well supported on the forums.