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?

http://www.sapphiretech.com/presentation/product/?leg=&psn=000101&pid=343

http://www.amd.com/us/products/desktop/graphics/ati-radeon-hd-5000/hd-5770/Pages/ati-radeon-hd-5770-system-requirements.aspx
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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 http://www.bjorn3d.com/read.php?cID=989&pageID=2709
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