Saludos, yo no se si me la jugaria, tendrias que mirar que tarjeta es en concreto; por ejemplo una SAPPHIRE HD 4870 X2 2G GDDR5 PCI-E te recomienda "650 Watt or greater power supply with one 2x3-pin PCIeR power connector and one 2x4-pin PCIeR power connector is required (1K Watt with two 2x3-pin and two 2x4-pin connectors for ATI CrossFireX™ technology in dual mode)"