The specs on your psu, using the link provided, shows that you have over 36 amps on the 12V rail. This is sufficient for a 5850 but not 2 if you plan on adding another. If you decide to run the card with this psu, you may experience issues to to the fact that your psu is not name brand and that the specifications may be exaggerated. But with the manufacturer's provided specs, you should be fine.
The specs on your psu, using the link provided, shows that you have over 36 amps on the 12V rail. This is sufficient for a 5850 but not 2 if you plan on adding another. If you decide to run the card with this psu, you may experience issues to to the fact that your psu is not name brand and that the specifications may be exaggerated. But with the manufacturer's provided specs, you should be fine.