When upgrading a graphics card, it is important to consider the power requirements of the new card. Depending on the size and type of card, certain power supplies may not be compatible with the new hardware. In addition, if the power supply does not provide enough wattage for the new card, it will need to be upgraded to ensure proper functioning. It is therefore necessary to evaluate all compatibility and wattage requirements before deciding whether or not a new power supply must be purchased for the upgrade.