When researching the new power supply, what feature does James need to look for to make sure he has enough power to run his computer with the new video card?

Power in watts also called Wattage

Explanation:

Power supply needs to have enough power to run a device or a computer, in a case where the device's wattage is greater than that of the power supply the power supply won't work. the solution will be to get a power supply with enough wattage to power the device or computer, considering the fact that video cards' wattage has increased in recent times.