Note: The Pc I am using was built for me by a company called eCollegepc. I had them put in all of the parts that I asked them to, since I have no experience building yet. I'm reading some of the reviews on that power supply, and it said people have problems with burning. Does that have something to do with over using, or overdoing what the power supply is capable of doing? I've had this computer since April to today and i've had few to little problems that weren't easily solved.
"EDIT: why do you want to add another GTX 660?"
I don't know, wouldn't it run better or would it not make much of a difference?
That PSU is more than capable of runing the GTX 660 in SLI.
Now about the SLI part, are you lacking performance in your games? Do you really need 2 cards? What games do you play and what resolution because the higher the resolution the more powerful card you need and more memory.
Well the two highest resolution/game setting games I have that I frequently play as of right now are Skyrim and Crysis 2, im able to get them both on ultra, I don't know the fps I get but it seems decent, but could be better.
Hmm, well I'm fine not playing the the absolute maximum settings, How long will the 660 last before Ill probably need an upgrade? Ive only had the 660 for about 2 months, I replaced a 6790 with the 660.
Well, I have a MSI GTX 660. And Ill probably upgrade to a 760 (or TI version) when NvIDIA releases them. And it depends. PC games seem to be on a high when it comes from the next big game to the next. As DX11 becomes more standard, Performace increases will be needed (Not saying the 660 cant handle DX11, Handles quite nicely actually)