Bring chilled ingredients to room temperature. Blend the Oreos to a crumb. Line the springform pan with parchment. Pour the Oreo crumbs in and pack the bottom and sides of the pan.
Place the pan in the freezer. Mix cream cheese in a bowl until fluffy. Add sugar and sour cream. Mix in chocolate, cocoa, vanilla and salt until combined.
Mix eggs one at a time. Pour water in the Instant Pot. Pour filling into the crust and cover with foil. Place on a trivet in the Instant Pot and seal. Pressure cook 35 minutes. Let sit for 15 minutes then vent.
Move the pan and completely cool. Then place in the fridge for 8 hours. Make ganache with chocolate chips and cream. Pour over top of the cheesecake and serve!