If u don't particularly want to reinstall, I'd go through all the hardware drivers 1 at a time and re-apply them.
Perhaps don't over-reach on the nvidia driver, ur card might prefer one closer to it's birthday. Be carefull on the oc with these too. The memory doesn't like oc`ing much at all and u can find that a 740+ oc on the clock will work fine for months, then all of a sudden fail. From that point the card might only like 710/720. (I've had this myself, blame the cooler tbh)