DJDeCiBeL :
Certified to run a 9800GX2, actually, not true SLI.
One of the reviews on Newegg:
" have owned this PSU for almost 3 years now, i am running a maxed out system "4 sticks of ram, 2 way SLi, sound card, network card, 4 HDDs, 2 DVD burners, and 9 fans" this thing has never even had 1 hiccup of a thought of dieing "knock on wood" i have my PC on almost 24/7/365 and continues to provide power when ever i ask for it."
I personally would not go with "HEC", as there are way better brands out there, but if you have it already, then I would not worry it too much.
To answer your question about BF3 and GW2, I ran Sli GTX560ti's at the time of BF3's release and I could still only run it @ High settings. It wasn't until I caved in and bought a HD6990 that I was able to go full ultra. It's nice being able to run any game I please on ultra though.