Yes, more is better than just enough. Don't make the mistake I made. I bought a nice Seasonic 620, and it works great but I will not be able to SLI 770s without changing it out for a more powerful one. Spend $120 now instead of $80+ $120 later. I wasn't initially interested in SLI, because I had a bad taste in my mouth from AMD Crossfire years ago. Now I will have to buy another power supply if and when I choose to SLI.