I have an PC Power and Cooling S61EPS 610w (http://www.newegg.com/Product/Product.aspx?Item=n82e16817703005) PSU right now. I'm about to install an i7 920 that I will overclock as much as I can possibly get to run stable. Right now I have an 8800GTS but am waiting to see what cards nVidia comes out with that will run DX11. Will my current setup be able to power such a card (I will not be running SLI) along with 2x DVD drives and 3x HDD? I've seen that what I have is actually underrated by the manufacturer (610w to 680w) but have never seen testing to prove it. I'm totally unaware of the power demands of newer cards. I'm more interested in nVidia comparisons as that's what I'm familiar with and will be using. If not, what will I need to bump up to to power everything?