I'm wondering how flashing custom bios would work with the warranty.  
 
A couple days ago a member on a different forum posted custom bios for many 670/680 cards that allows the voltage to be increased to 1.2120 without the need for a hardware mod.  Basically accomplishing the same thing Evbot can do for Classified cards. 
 
I was thinking about attempting this with one of my 670 FTWs but I wanted to see if it voids the warranty.  Would it be similar to installing a customer cooler? Meaning if put back to it's original state prior to an RMA then it's OK?