I created my own custom bios for my gtx titan, but didn't know where to post it, so I am uploading it here as an attachment.
This was my first try, so the bios is probably not tweaked to squeeze out max performance from my card.
Info & GPUz validation link : http://www.techpowerup.com/gpuz/4fva6/
+ I cranked up the voltage limit to 110%
I tested my card's stability by running Unigine Heaven for 8hrs, temp did not go above 66 degrees Cel.
As for performance increase, At stock, I used to get 35-40 fps on witcher 2 [Everything maxed out with ubersampling on], now I am getting a solid 60fps.
Try & modify as U like. [[B][U]I am not responsible for any damage[/U][/B]]
Titan manufacturer : ASUS
Cooler : Stock Air.
[PS. probably don't have to say this here, but take a backup of ur bios before flashing
UberTitanROM1.zip 157k .zip file