I would try using
this to remove the drivers in Safe Mode, reboot, and try installing the drivers again.
Thanks for the link, tried it. Windows installs it's standard drivers after that and the crashes are not there anymore. The card needs its Nvidia drivers though to work to it's full extend and after installing the latest drivers, another crash and recovery, after starting firefox and MSI afterburner the crashes/recoveries start going up in numbers until they come every 5-6 seconds again.
MSI shows GPU temps of 45 degree without doing anything except for regular spikes to zero, probably indicating the crashes/recoveries that way.
Funny side-detail, when the screensaver kicks in the crashes don't seem to happen, or they happen in the background and do not affect the screensaver for some reason.
Whatever the Nvidia drivers are accessing is probably damaged. I wouldn't know what else to do, set the power management to "prefer high performance" as someone seemed to resolve his problems like that, didn't work for me.
I'm hesitant to go and buy 970 to bridge the time until the 980ti cards show up but I feel like I have no choice, maybe I'll try an AMD GPU as I'm scared I even get these crashes with a brand new GPU because it is Nvidia related?
Well, bummer!
EDIT: I'm calling bullshit and I'm in disbelief...
For the unprobable case you are reading this DearJules from the TomsHardware website
spread the word I don't know why but what you suggestet seems to be working for me.
Changing the PCI lane in BIOS from 1 to 2 fixed the driver crashing/recovery cycle, I have no Idea why that fixes the problem and why this problem turned up after nearly 2 years out of nowhere, but I'm glad it does. What could this mean? Hopefully it doesn't show up again, not sure if another change in BIOS will fix it again and then running out of options would be bad!
I didn't change the actual physical slot/position for the card, I just changed the bios setting (that worked flawlessly before) ....so is that a software or an hardware thing?
Whatever it is, I found tons of people on the net that had the same problem and people going crazy looking for an answer. This seems to do it.
Without googling hard I would have bought another GPU and would have run into the same problem again.