80c is fine for Nvidia cards - they are meant to take up to 100c
however my stock 570 sits around 58-60c under load
be a good idea to set up an aggressive fan profile with EVGA precision
the passkey can be found at stanford
http://fah-web.stanford.edu/cgi-bin/getpasskey.py Ive been running mine 100% of the time either folding(mostly folding) or gaming for over a full year
machine only goes down for servicing
the card is under warranty - if it dies - I get a new one
after warranty expires, it time for a upgrade anyways
with my latest purchase I can now enjoy playing a game with my 3930k x79 chugs away 45k PPD
you won't get much folding with the x4 -the 570 will generate most of the points
however it's running anyways - so fold away
Also a good idea to keep reading the forums on a regular basis
that way you can get advice - learn some things and get in on contest we occasionally run