So with default or ln2 bios with anything other than completely default settings I get crashes device driver hung error messages when gaming, could this be power problem I never had this issue with my GTX780....ideas?
I have a corsair AX1200-a couple of years old..
Asus X79 Deluxe  PCIE spectrum OFF, 4930K stock, (XMP Setting).
Noctua NHD-14 SE2001
16 GB 1600 Mhz memory
4 SSD
1 1 TB Black HDD
Soundblaster Z
GTX 780 ti dual classified
Precision X16
Driver: 344.75 and phys x only no experience, HD or 3D drivers installed

Probably your card work on fabric clock as last stable clock.
It's little weird thing that usually benchmark tests pass on 50-100MHz higher clock than game stable...
But if 1020MHz clock is last stable clock at least after 10-12 months card will become unstable.
I listen Jacob when he talk with some guy in studio about fabric clock their cards and how much they OC usully, he say they usually go with some clock enough to offer good even best performance on market and to leave space for customer to overclock little because they must be sure to card work whole 3 years on same clock. For that I think usually need space of at least 50-75MHz for OC... But from other side he say they can't go too much with OC because no enough quality cheap. That is true offer would be very small if they launch GTX780Ti with 1100MHz based clock example. 10% cards could resist 3 years gaming on such speed with all NVIDIA limitation and voltage restriction.
Many people who OC their reference cards on 1300MHz boost they couldn't play all games properly even on GTX780Ti Classified boost 1150-1170MHz. Because of that is weird how card stop in benchmark and in game on same clock. In that situation maybe some other part on graphic card not work as should and have nothing with chip quality.
But if card work on some clock as last stable even if pass benchmark test only on 20MHz more he will show instability sooner or later.
No any doubt in that.
Biggest chance when she need to work on 99% to allow gaming example  50-55% fps.

03G-P4 -2888KR

Given that you have only a single card and an AX1200, as well as the rest of your system, it's pretty close to impossible for that power supply to not have sufficient power for your system.  On the other hand, if the PSU is defective, then it could cause crashes for that reason.  If you go into your BIOS, and go into the Monitoring section in Advanced mode, what are your 3.3v., 5v., and 12v.?
 
What game or games does this occur?  Have you tried going back to a previous driver?  You mentioned the psu was about 2 years old, but how old are the rest of the components, such as the video card, motherboard, etc.?
 
Is the motherboard BIOS up-to-date?  The rest of your drivers up-to-date?  Not just the video card, but also chipset, Audio, network, etc.
 
 

you should try using Classified voltage tool =to very slowly bump the voltage.  Go to overclock.net and scroll through the first post if you WANT to slightly overvolt your card.  Push +100 mhz is a LOT of difference compared to what you mention "anything other than completely default settings."  Sorry, but that is the same thing I get with my card.  You will need to start giving it voltage as well.  
 
If you aren't overvolting with the classified voltage tool, then it may not help you overclock. 

so far no crashes using the tool with 1.2125v and +120, will post if problems resume....thanks

well I was able to run COD ghosts for 45 minutes then hit a wall v=1.375 and still crashes, reduced the oc from +120 to +100 still not stable...dunno whats going on

Sajin
The card is fine if you're not crashing at default speeds. Anything above default speeds isn't guaranteed.

+1.

msqdavbar
Yeah I would agree but now it happens with no OC in COD ghosts.

Only in Ghosts?

msqdavbar
DXGI_ERROR_DEVICE_HUNG_ERROR

This error usually happens when precision gets corrupted or your card is unstable. If the error doesn't show up after removing precision then that was most likely your issue.

Just stick with what works.

DXGI_ERROR_DEVICE_HUNG_ERROR is usually unstable card same as Driver Stop Working and Recover...
If you found stable point don't change nothing. But I afraid if card is unstable on default settings crash will back.
 

chadro777
same problem i had with my 780ti dual classified. You have to underclock on certain games. works trust me.

That's shame for EVGA, underclocking Classified cards.
If that's last solution, that would be definitely last EVGA graphic in my life.
Why people pay 150$ more, to go in opposite direction, instead up with clock, they should go down.
Someone buy cards with higher clock to avoid overclocking, now must to do that only in opposite direction.
More graphics like that and ASUS will sell more motherboards and graphic cards to ex EVGA customers.
For them is fun to read to such problems on their site because that nicely explain why their clock is inferior and turn customers to them.
Anyway stance of most people there is that EVGA motherboards are inferior from software and hardware side to ASUS motherboards with far less options and much worse compatibility with RAM, HDD, SDD, M.2 devices and more unstable graphic cards than anybody because higher clock and that customer pay price of that at the end.
EVGA lose concept completely, one series show up, people hurry to buy cards and they are usually collateral damage because after 3 months show improved version, or never know, bad calculation in supplies and after you open box you recognize completely other memory, VRM, no EVBot etc like nothing happen.
 
 
 

Since I am the one that started this thread....I ended up RMAing that particular card and getting a replacement card from EVGA. At the risk of getting flamed....I have given up on the notion of trying to OC at all since the most I could get out of the second card with a skynet bios was +35 for everyday use. I have an ASUS x79 deluxe board and a 4930K chip at 4.3 Ghz. I guess there are just some cards that do not clock over well and a least the last few I have had this has been the case: EVGA 770 ACX, 780 ref, 2 780 ti dual classified. I am runnig well now at stock and really better without any crashes since just running on the stock LN2 bios.....so much for my update, i never had to downclock though