Powering up new pc with 4870 asus 1gb

m/b GA-EP45-UD3L, 4gb ram, asus 4870/1gb,power supply 450W. Just have finish all ass'y and got to screen massage
"check power connectors on video card refer to power setup guide".
Asus 4870 1Gb comes only with one power connector. Reading map for m/b find note about power supply min 500W
with expansion cards. My question is what next, new p/s or 2nd power connector for video card /why wasn't in the package?/Plug and pray did not help this time, thanks for any suggestions.
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More about powering 4870 asus
  1. Doesn't matter how many connectors they give. The card needs 2 connectors. If your PSU does not have PCI-E connectors, it must be below par. What brand is it? How many amps. on 12v?
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