Power tests show very low power consumption on this video card, however that PSU should be replaced anyways. It should work, but if you go over spec the voltages will go crazy.
Do you already have the video card? If you have it, you could try lowering the power limit on the graphics card to around 75% in the meantime.
If you want to buy new power supply, I can give you recommendations on that (Don't buy Corsair unless you go high tier).