Here is Guru3D's power supply recommendation:
AMD R9 290 - On your average system the card requires you to have a 550 Watt power supply unit.
AMD R9 290 Crossfire - On your average system the cards require you to have a 700 Watt power supply unit as minimum.
AMD R9 290X - On your average system the card requires you to have a 550~600 Watt power supply unit.
AMD R9 290X Crossfire - On your average system the cards require you to have a 800 Watt power supply unit as minimum.
If you are going to overclock GPU or processor, then we do recommend you purchase something with some more stamina
Here is Guru3D's power supply recommendation:
AMD R9 290 - On your average system the card requires you to have a 550 Watt power supply unit.
AMD R9 290 Crossfire - On your average system the cards require you to have a 700 Watt power supply unit as minimum.
AMD R9 290X - On your average system the card requires you to have a 550~600 Watt power supply unit.
AMD R9 290X Crossfire - On your average system the cards require you to have a 800 Watt power supply unit as minimum.
If you are going to overclock GPU or processor, then we do recommend you purchase something with some more stamina
Here is Guru3D's power supply recommendation:
AMD R9 290 - On your average system the card requires you to have a 550 Watt power supply unit.
AMD R9 290 Crossfire - On your average system the cards require you to have a 700 Watt power supply unit as minimum.
AMD R9 290X - On your average system the card requires you to have a 550~600 Watt power supply unit.
AMD R9 290X Crossfire - On your average system the cards require you to have a 800 Watt power supply unit as minimum.
If you are going to overclock GPU or processor, then we do recommend you purchase something with some more stamina