to start off I have been flashing nvidia bioses for quite some time with out issue.
 
I just recently got a 2 gtx 680. My first one was an EVGA 02g-pa2682-br. 2gb superclocked. The second was a standard 2 gb card. I was having some strange base clock and boost clock modulation, and flashed the OC bios to my regular card. I know stupid!! The card i originally flashed was in position 1. being the vanilla EVGA card. I flashed it and rebooted, only to have horrible artifacting.. So i dismantled my loop UGH! and placed the problem card in the bottom slot, almost immediately after the problem arose. I quickly flashed it back, and the weird thing is i can't see it any more in NVCP SLI config settings. The GPU-Z picks it up, and the sensors are registering.
 
I did notice something very strange. The index number for the erroring out card and what i'm assuming is the NF200 chip in my motherboard are very similar in ID, or pci block numbers. Could i have flashed the SLI chip on the board?? or something.. I still have a problem with this card reading. comes up in device manager with exceptio icon.
 
Thanks in advance

I would be carefull : some graphic cards can "half function" even when not plugged to your PSU (very old one like GT 7900 from my experience).
So it might be detected, and you might start to flash it accidentaly, which could be damaging if the card is "underpowered" (the firmware update process could not be done properly).
 
 
 

Is there anything better or more secure than nvflash?

nvidiatweaker
updated the system info.. and plugged in the bottom card. I also have a weird problem with the indexes not being correct.. my software has always been like that. all software reads my primary card as the no. 2.
 
when i punch out, i will try to stick the bottom (problem card) up top.. not an easy task

The index number thing is an NVIDIA driver bug which is fairly well known. Lots of software reads the cards in differnt positions than actual due to this bug. Just make sure that you use the index flag in your nvflash command to make sure you only flash the card you want to flash.

nvflash --index=2 BIOS.rom


Nvflash is the most trustworthy tool for this sort of thing that I know of.

I am very use to command line, so i just went with what i know.
 
Update!!! Apparently the bios file itself was corrupt. I went to tech power up, and downloaded a clean bios... and wala!! all back in business. thank you so much for all the help
 
 

 
Glad you got it sorted.