There are currently no updates in our database for this graphics card that I can find. I'm assuming you are experiencing some sort of issue with your graphics card or are you just curious?
 
Please feel free to contact our customer service team for any technical support via email at support@evga.com or give us a call at 1.888.881.3842. Our office is open 24 hours a day, 7 days a week.

There is no performance vBIOS for this graphics card, you may be referencing the custom vBIOS that was created by some modders a while back. What you can do is if you have not flashed your Master bios, you can extract the vBIOS file using GPU-z and or NVFlash then you can use that file to flash your Slave bios. 
 
Please keep in mind that EVGA does not support or condone altering the stock vBIOS unless provided by EVGA.

Found the slave vbios after doing some digging on the net. 
 
You can download the 970 FTW+ slave vbios here. 

It will be the same that Evga provided nonetheless.

Svetlin.I
Thanks for the help :) i was able the fix it.