so guys i have prebuilt hp 510-p199na desktop pc and product name is Y1B84EA#ABU serial number is CNV63612TM and it came with amd a10 and 180 W uATX Energy Star 6.0 internal power supply and 8gb ram i wanna add Gigabyte HD 7970, so does anyone know what PSU will fit to support the following GPU and how much watts are recommended