Quadcore14

You are barely touch the 600 watts so I would recommended the 650w or if you want get the ax850 so far seems to be a bit quieter and hopefully more reliably with its 7 year warranty. If you want a rough calculator use this www.extreme.outervision.com/psucalculatorlite.jsp but dont forget it is not just watts you also have to watch amps being pulled from the rails. Although I cant see a gtx 560ti sli pulling anywhere near the amps output of your psu or the ones I have recommend. As I am running a 2600k@4.9Ghz and GTX580 sli on the ax850.

I had the same thing happen with my X58 system. I had a HX1000 and I always considered it solid as a rock but for some reason this randomly happened after 2 years of use. I was told it was either a bad connection or my power supply just overheated and over-volted on the pins causing the first bsod. Still makes me sad to think my just over 5 year psu died(no warranty) but it made me buy the newer ax850 and move to sandybridge. I would contact Corsair and see what they can do if the psu is still in warranty, they should replace it for you.