So I am trying to move my Voltage limit up on my Titan X Maxwell. Right now I am hitting 1.243v and trying to move it up to 1.275. But every time I mod it to go higher the card will not post and ill have to re flash the modded TDP bios I made for it just to get it to post into windows again. ( So you know I am using a second card to re flash the Titan X when the flash is unsuccessful). If anyone knows why I can get it to lift the 1.243v restriction I would be in your debt. Also if anyone can take a look at my bios for me and help me out that would be cool. Just let me know how you would want me to send it to you. Thanks in advance.

As it's at the loading screen for windows 10 where you see the windows icon and the circle at the bottom spinning right before windows login. It will freeze right there and switch to my gt 1030 to login t windows and the titan x is detected in device manager so I just disable it and re flash every time it fails.

Nope it boots to my other card. It seems that as soon as I try to touch voltage in the bios it will not post into windows. The card works fine if I don't go into windows.

Cool GTX
Your Not the only person having issues with the newer Nvidia drivers & modded BIOS
 
Both of my EVGA TitanX SC are currently flashed to the cyclops3.rom bios
 
You'll find it at:   overclock.net 
 
Check post 18218  Rolling back to Nvidia driver 385.69
 
Check post 18220 in the above thread
 
Check post 18233 if you get error 43 with Win 10 auto installing new drivers
 
What are you starting with ? modding the stock BIOS ?

Yes, a lot of people have had issues with the latest drivers when running a modded vbios. Everyone I have seen running a modded vbios get the code 43 error. e.g. https://forums.evga.com/EVGA-GeForce-GTX-980-Ti-SC-Code-43-m2732307.aspx
 
 
@warcobra
 
What happens when you remove the other card from the system? Does the titan x throw a code 43 then?

Another Update: Did not get get error code 43. I had to end up using the Windows Show Hide fix and the 385.69 Driver and now it works I raised the voltage to 1.275 with out issue. Runs stable as far as I can see with the short amount of testing I had time for so far. Sad thing is I can't continue to use this driver for gaming because it does not work with a few games I'm playing right now including Battlefront 2. So I guess I hope nvidia will have a more recent driver that will fix the titan from crashing under vmods. but thanks for all the help everyone. It's working and thats all that matters now it just a matter of when if ever that we can use newer driver for vmods. 
 

you guys might want to check out the voltage mod that modifies the sensing system the bios uses to limit power.  many people make a slight mod with some liquid metal that can be easily removed.  check it out ... 
 
 
 Cool GTX
 i will be checking out your links, thanks.