Let me try to address the original post.

I am running 570's which are about the same as your cards.  You can tweak the speed and memory speed up a bit and see how stable your cards run.   I have found that some 'pools' run ok with this, others run badly.

Make sure you use your Nvidia control program to control the fan speed and do yourself and cards a favor and just set it up high.  Yes it will be a bit noisy but you want to make sure your cards are cooled.

On thing you NEED to be aware of,  if the miner crashes, the card probably WILL recover and you will most likely NOT get a blue screen but, the fans get dumped to minimum speed.  Do make sure you set them BACK to high speed.  Once the driver gets 'thumped' like this it may not control the card fan correctly and you can find yourself mining at around 85 to 90 C   NOT a good thing.

If you are running multiple cards, a bad event on one card may or may not affect the other but I have seen where both sets of fans got turned down during a 'recovery' so monitor your miner carefully for a few hours after you have done your tweaking to ensure stability before you head to bed for the night.

Aaron