I have a second computer which has a Gigabyte GTX 780 Ti OC model number (GV-N78TOC-3GD) and I also have been experiencing lots of crashes in games. The issue with my card is the fact that the gpu isn't very stable at the voltages set in the video bios. Sometimes the gpu needs a little more voltage then what the stock bios can provide.
I fixed the problem myself by modding or editing the stock video card bios and adjusting the voltage limits as well as limiting what the max boost clock speeds I would like the card to run at while at the same time giving the gpu more power to utilize.
I will provide a link to my zip file which will have all utilities that you will need to flash the bios, edit the bios to your gpu, plus I have provided 3 bios's that all work awesome on my video card. This is not endorsed or official so please flash at your own risk. All 3 of my bios's were created by using the official bios for each of these Gigabyte cards: GV-N78TWF3-3GD, GV-N78TOC-3GD and GV-N78TGHZ-3GD.
To flash the bios simply follow these instructions:
1.unzip the file to your desktop.
2.double click on the folder and choose which of the 3 video bios's that fits your cards actual gpu clock speeds.
3. copy the bios that you have decided to use and paste it into the ez3flash folder.
4. double click on the ez3flash application and press the number 3 and y to continue
5. you may have to press the y key again
6. let the utility finish and you will hear a beep.
7. restart your pc and test.
One tip is that you may have to uninstall your NVidia drivers and reinstall them after the flash or wait a minute or two after logging back into Windows so it can setup the video drivers if you had flashed a bios for another card. All 3 of these cards bios (GV-N78TWF3-3GD, GV-N78TOC-3GD and GV-N78TGHZ-3GD) are interchangeable.
Please note that I edited these bios's myself so if you see anything wrong with them then please let me know. I'm no expert but what I have done is keeping my video card from crashing at all. For the first time my card is rock stable and the temps only went up 2-3C on my card.
Please note that this will do nothing if your particular card is having memory issues as these bios's only fix gpu core instabilities.
To keep things simple it is best for owners of the GV-N78TWF3-3GD cards to use the bios that is inside the "With 1006 Mhz Actual Clock Speeds" folder.
Owners of the GV-N78TOC-3GD cards should use the bios that is inside the "With 1150 Mhz Actual Clock Speeds" folder.
And finally owners of the GV-N78TGHZ-3GD cards should use the bios that is inside the "With 1202 Mhz Actual Clock Speeds" folder. I lowered the speeds of this card slightly due to the numerous issues these cards have at high clock speeds.
The exception for my recommendations would be if you have a card with really high ASIC quality and or overclocks well then you could use a bios that is faster than what your card was originally intended for.