I bought an Asus desktop a year or two ago, and needless to say, it can't run crap. I have picked out a video card and a PSU to upgrade to around Christmas, but I need to know if this 550W will be enough for my current specs.
I just bought the same graphic card. My suggestion is dont get this card.
I got it like 2 days ago the 1st night was working fine. Next morning I woke up and it got a problem. My screen completely froze and it display the most weird stuff I ever see. My PSU is 600W btw i5 and 8GB ram
That PSU should be fine for 2 x 6850's. I like Antec PSU's, their customer service if very good, if you end up needing some service. The PSU has a 3 yr. warranty and has 37A on the combined 12v rails (used mainly for GPU power).
I've always had good experiences with Sapphire GPU's. I'm not sure how good Powercolor is at this point in time, so I can't comment on them and their quality.