Just purchased a HP Envy 700-215xt and want to upgrade the power supply to 700+ watts so I can upgrade to a better video card

Open it up and check to make sure you have normal connections, you should have a 24 pin and a 4 or 8 pin to the motherboard, if you have more than that or don't have those then you're in trouble. HP recently started being dicks and using proprietary power connections again, hopefully your's is a standard PSU.
 

Dark Lord of Tech

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