Nvidia 3080/3090 with egpu

Hey everyone I am not too sure if the new nvidia graphics cards will run efficiently off of razers current gen egpu pci ports. Nvidia recommends extremely high wattage but the actual cards themselves don't even add up to what they say. Is that including everything you are powering with your psu plus the card itself because if thats the case since I'm using a high end omen laptop by CUK then it shouldn't be a problem since the laptop has power from itself via ac. Thanks guys!