Originally posted by Gazra
I got one just because I am upgrading it every week nearly so instead of buying things and then it needing more from the PSU I just got a bigger one instead. I mean I have just added another 2 HDDs and another DVD Drive so it made more sense at the time lol.
Your perception on how much wattage is needed is completely misguided.
An overclocked i7-3960X + a single GTX 970 at full load consumes <300W.
An overclocked i7-3960X + two GTX 970 in SLI at full load consumes ~450W.
Unless you're going to crossfire two high-end AMD GPUs (known for being extremely power hungry), such as the R9 290X, you don't need any more than 600W. Just pick a high-quality 500-600W PSU; fyi, Corsair CX is not. I tend to pick my PSUs from Seasonic and Seasonic rebrands, such as XFX.