Will my power supply support SLi GTX 570? What CPU Should I get?

So I have a GTX 570 with a 630w power supply, I'm looking to upgrade it to a SLi, I'm also looking to get a new CPU to overclock it, which would you recommend?

Here are my specs:
Intel i5 3550 (3.3 Ghz)
Corsair 8 GB DDR3 RAM
2 TB Hard-drive
Currently 1 GTX 570

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    I would get a 750 watt psu just to be safe unless you have a high quality PSU with silver or better efficiency. The I5 3570k is great for gaming and over clocking, and it's reasonably priced.

    says 550 for system + 219 for 2nd card ... so even a 750 is bit tight,13.html

    Here is Guru3D's power supply recommendation:

    GeForce GTX 570 - On your average system the card requires you to have a 600 Watt power supply unit.
    GeForce GTX 570 in 2-way SLI - A second card requires you to add another ~225 Watts. You need a 750+ Watt power supply unit if you use it in a high-end system (800+ to a KiloWatt is recommended if you plan on any overclocking).
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