How much watt PSU will I need?

Kevin3014

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Feb 28, 2014
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Hey guys!
I'm building a PC and I don't know how much watt's PSU I'm gonna need. Please help me out :)

My specs are,

CPU : Intel Core i5 3470
GPU : Zotac Geforce GTX 660 2GB
RAM : 8 GB DDR3 RAM (4x2)
M.Board : Gigabyte GA-Z77MX-D3H
CD Drive : Asus DRW-24D3ST DVD Burner Internal Optical Drive
HDD : 1TB

I might SLi my GPU after 6 months or so and do tell me the watt's required for one GPU and two GPU. Btw, only tell me the PSU which is sufficient for this PC since I won't be upgrading it for a few years.

Thanks!