I recently bought a GTX 970 SC ACX 2.0 and have also been having the same issues after about 30 minutes to an hour of gameplay on Far Cry 4 and Battlefield 4. With the consensus apparently being to get a replacement card i guess i will be doing that too  
Although, I will be getting a replacement from Amazon because I bought it there and its still under the warranty. Would anyone recommend an RMA directly to EVGA vs. a replacement form Amazon?

I'm having the same issue, I've tried bios updates, driver updates, re inserting the card, turning fan speed up etc. Nothing has worked permanently. Is it a bad card or could it be a bad dvi cable or something like that?

Try the card in an other system, if possible. this is by far the best way to check it. it is possible that there are software issues causing major bluescreens "blackscreens" but they are unusual. 
with changes hundreds of settings you will in the end just waste your time. 

I'm also one of the many affected by this. Are Nvidia or EVGA even doing anything to solve this?
 
I've completely lost trust in these companies as I bought an expensive and high end product that is giving me nothing more than headaches.

eVGA seems to have a good rma policy, faulty cards can happen, i can wait 2-3 days. 

At this point I don't believe this to be just faulty cards, there's been people who RMAd cards or exchanged for a different manufacturer and they keep getting the same problems. I don't want to RMA a card just to play GPU lottery and keep switching cards until I get one good one. 

Hello,
 
In case there are new readers, that are having the same issue as mentioned above. I used this forum as a troubleshooting guide. I did everything mentioned by Morphe and Malboja. In short, my experience was this: Played Dragon Age: Inquisition and would have video crashing within 1hour of game play. I would have no video display and have to hold down my power button to cold-restart my computer. After a day or two this was becoming an issue an multiple builds and every config with BIOS and NVIDIA drivers known to man. Oddly enough, nothing else (that I tested) was effecting my 970 in the same way, only DA:I. I could play demanding games like Far Cry 4 and not so demanding like WoW without any problems at all.
 
My DVI port didn't work (worthy of an RMA) and I was getting some board noise when using headphones. (not 100% sure it was the card at the time, but tested with my 660ti without an issue), and finally, the video crashing. I decided to give it one last go, and see how long it would take my game to crash while I had a day off of work. Within 5 minutes, everything crashed. Which scared me since it was so sudden compared to the 1hour windows I was getting before. Only this time, I wouldn't get any video even after the cold-reboot. I cried for about 2 minutes and replaced my 970 with my old 660ti.
 
After RMAing the card, and having to wait over both Christmas, and New Years for my RMA to be finished (over 3 weeks sadly, but totally my fault for not taking action more quickly), two of three issues SEEM to be resolved. No more crashing for Dragon Age (so far), and no more dead DVI! However I am still getting some feedback noise, which only started when using my 970 card. My 660ti is fine. But that I can deal with, since it's not terrible.
 
I wanted to post on this thread because I wanted to let other readers who might use this like myself, that an RMA did in fact resolve the issue.
Only thing I can come up with is that we are all customer who purchased the same card around the same time, and have 1155 socket CPUs. Coincidence?

It's nice to see a thread about this. I've been having this problem with my GTX 970 SC as well. Dragon Age Inquisition would crash after about 7 - 10 hrs of gameplay. Lara Croft and the Temple of Osiris will crash after 5 minutes of gameplay every single time. I underclocked the card and that let me play the game all the way through without crashing, but as soon as I put it back to stock it would give me the black screen. I've swapped out power supplies and tried everything I could think of to fix this problem on my own. I've decided to RMA the card based on this thread with hope it will fix my problems as well.

I purchased my gtx 980s mid February and BOTH cards exhibiting this behavior . Bought mine from newegg . Nothing works to fix the issue . Swapping cards pci ...switching to pcie 2.0 ....down clocking ...nothing ...every time I play Guild wars 2 It will be fine for a length of time then my tv will just stop receiving signal ...pc will still be running but no signal to pc . I'm still in game as confirmed by my friend I play with and can even type by hitting enter ..typing ....and hitting enter he sees me type ....it's been a running gag for my guild ...I spend 1100.00 on two gtx 980s and can't even play a 2 year old game . Thinking of trading up to two titan x in sli and see if that resolves my issue if evga could hurry up and release the darn things

It's not the video card...