Ati hd 5770 power supply be quiet 450W

I own a PSU be-quiet 450W, and a bought sapphire hd5770, at sapphire website says i need at last a 500w PSU, but ati website says 450W. May i have problems?
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More about 5770 power supply quiet 450w
  1. You will be fine with that PSU if it is the same one as in this review
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