You need to be looking at why it is Blue screening and if you need to downclock your card, I would be looking to RMA. That certainly shouldn't be happening in any game.
I've already been in contact with EVGA and had the option to RMA. But having spoken to the tech and gone through a few forum posts decided not to RMA as it wasn't certain if it's the card or an issue with Win8/Nvidia drivers.
The BSOD's with BF3/Crysis3 seem to be a common issue with the OC cards, it was speculated that the BSODs are a sign that the OC is to close to the cards limits, or a sign that it needs more volts (perhaps?).
The card will run for hours without issue on max load with various benchmarking tools, such as Heaven.
But perhaps a conversation for another thread rather than moving this one off topic.