I am going to get the Radeon HD 6870, but I don't no which one to get. Right now I am looking between the Sapphire model and PowerColor and is 550w PSU enough?
http://www.newegg.com/Product/ProductList.aspx?Submit=ENE&DEPA=0&Order=BESTMATCH&Description=6870&x=4&y=35
Or this
http://www.tigerdirect.com/applications/SearchTools/item-details.asp?EdpNo=6817295&CatId=3669
http://www.newegg.com/Product/ProductList.aspx?Submit=ENE&DEPA=0&Order=BESTMATCH&Description=6870&x=4&y=35
Or this
http://www.tigerdirect.com/applications/SearchTools/item-details.asp?EdpNo=6817295&CatId=3669