Erm...hate to break it to you but 80c is NOT ok.. the core is overheating, quite badly. At very least remove your stock cooler, clean off the stock thermal crap and invest in some AS Ceramique. If you have the eye and hand for it also lap the base of the stock cooler with course and fine grit sandpaper to a smooth near mirror finish. This could bring temps down as much as 15-20c, no joke.
WARNING: I am cracking down on stupidity in the forums. Anyone caught making a dumb statement clearly not knowing many, if any of the facts, will promptly be directed to xtremesystems.
Sig edited. If anyone wants to know about the E4400 (E7200 sold) drop me a PM