Is 460w enough for Aurora R7 with gtx 1080 and 8th gen i7?

I already ordered the computer, it's arriving in 3 days, but I'm starting to have doubts about the power supply (460W APFC PSU Air Cooled Chassis).  I plan on using the PC to run games such as Overwatch on max settings, do I need to replace the power supply right away?  It is nearly $60 cheaper to buy a new one than if I had selected the 850w supply anyway, so it isn't that bad, I just assumed that since the site allowed me to select the 460w that it would be fine.