cool, coz back then i had a doubt that it can't, because from amd/ati website, is says that my PSU (corsair hx1000) can handle only 1 radeon 5850/5870 and 3 radeon 4000 series.
it may be on the edge , but i've seen gtx 280 (not even 285) SLI run on corsair cmpsu 650tx . and the 5850's are way better than those power sucking babies
It's nowhere close to the edge. You could CF a pair of 5970s and it would still handle it (though if you overclocked them, you'd be cutting it pretty close).