The card doesn't need much, from what PCPartPicker shows, it needs 50 Watts, but don't forget to factor in all the other components in your computer and if your motherboard doesn't support PCIe, then you cannot use your card, but I'm pretty sure you probably do have a motherboard probably has PCIe slots. The graphic card may only need a bit of power, but the other components may hog the rest, don't cheap out on a power supply.