Hmm...... I read that article and it said that the 480 2-way SLI's hit all the way up to 900, but that was with a Overclocked i7.. Maybe I should go with a 1000w If I were to overclock. It also said that nothing less than a 800watt. I should be alright but, I would have to buy a 1000watt or so to do so.
To clarify, that setup sucked 900 watts AC from the wall at ~87% efficiency which translates to less than 800 watts DC being produced and the power supply you found can produce 840 watts at 12v DC (the 12v rail is the only one that really matters)