It relies upon the illustrations card you are getting. If you are getting a design card having a 400W PSU proposal and you are just having 300W or 400W PSU, then you need to show signs of improvement Force Flexibly for it.
It is in every case better to get a somewhat higher wattage PSU than what is suggested by the producer on their site as a result of the force utilization by different parts, case fans, and for future updates.
Mid-range and top of the line designs cards do require 6-pin/8-pin PCIe power connectors, so keep this in mind while redesigning your PSU. Notwithstanding, you may likewise utilize 6-pin/8-pin connector links for driving your illustrations card if your capacity gracefully needs 6-pin/8-pin PCI-Express force connectors.