http://www.overclock.net/t/183810/faq-recommended-power-supplies cross reference that list with the other list you need around 650W so Antec NEO ECO 620C but i would suggest going to newegg Canada and picking my sig rig's psu(Rosewill Green Series 630W) for a much better price than the Antec NEO ECO 620C which is the same price as my sig rig's psu in America weirdly enough
edit: my sig rig psu is on the list!, also someone please correct myn power rating if it is off but I am sure it is 650W or 750W can't quite pin down which one
edit 2:looks like you COULD do a 650W psu with a crossfire setup of 7970 but would be cutting pretty close! go for a 700W psu!
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