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Here is Guru3D's power supply recommendation:
Radeon HD 6850 - On your average system the card requires you to have a 450 Watt power supply unit.
Radeon HD 6870 - On your average system the card requires you to have a 500 Watt power supply unit.
If you are going to overclock CPU or processor, then we do recommend you purchase something with some more stamina.
Here is Guru3D's power supply recommendation:
Radeon HD 6850 - On your average system the card requires you to have a 450 Watt power supply unit.
Radeon HD 6870 - On your average system the card requires you to have a 500 Watt power supply unit.
If you are going to overclock CPU or processor, then we do recommend you purchase something with some more stamina.
Wattage wise it's big enough,
quality wise, I don;t think so ... reviews I found were in languages I don't read.