Have you tried running MemTest on the RAM?
You can get MemTest here: http://www.memtest.org/
I just recently had 2 X 2GB DDR3 1600MHz Corsair XMS RAM crap out in my in-laws computer that I built for them. Corsair sent me an RMA number to return the ram and get it exchanged but I had to pay the shipping. I know that is standard practice, but I had a couple of Crucial sticks go bad a few years ago and they sent me the new sticks with a postage paid label to send the defective sticks back with. So instead of paying $10 for postage and packaging, I just bought 4GB of Crucial RAM at $17. However, your ram is much more expensive and is worth the expense to RMA them.
EDIT: Just noticed you bought the RAM within the last few weeks. You should be able to return it to where you bought it for an exchange and not even have to mess with an RMA with Corsair. Also, when using MemTest, test each stick separately.