Hi there i wonder if you could help me. I have had my 970 GTX for over 6 months now and in the last week or so some strange stuff has been happening. 
 
Playing Overwatch and i start getting funny green patches and flashes on my screen. it only happens when i have played for over 30 mins. but does not happen with ever game as i played Counterstrike and its fine
but then i purchased Battlefield 1 and it happens 10 min in and its getting worse.
i have 2 monitors 1 dp and 1 HDMI. 
 
things ive tried. 
running 1 monitor at a time and they still both get this issue. 
turning all settings down to low on BF1 gets me maybe 15min longer before it happens. 
 
i have still in my drawer my old EVGA 580 so i popped that in yesterday and everything has been smooth and fine.
put the 970 back in today got 10 min in on bf1 strange colours on my screen. then i get a device disconnected and failed NV driver msg from windows.
 
 
System specs
i7 4770K @4.4
16GB Ram
500GB SSD
EVGA 650 PSU
EVGA Motherboard.
 
could the card have a fault or am i missing something ?

Sounds like the card is failing. Try running the card in debug mode/underclocking it with msi afterburner.

how do i run the debug mode ?

Look at #3/#4 listed here.

thanks will look at this now and test.

well i tried the debug and it helped a little used the EVGA app and downclocked it by 150mhz and it all runs smooth.
 
so i guess that means to card is going bad ?

Pretty sure the card is bad. How old is your psu?

same time as the card about 6 months. works fine with my old 580 tho. i think that uses more power.

Valthos
same time as the card about 6 months. works fine with my old 580 tho. i think that uses more power.

Yeah, time to rma your 970.