I'm not sure why they said to not go over 80%. If you're not maxing the cores out 100% it's not a good "stress test". I'm also not sure why orthos isn't running @ 100% as it works fine for me. I'll do some digging and see if I can figure it out.OK-- I just found one person on one forum that said not to go over 80% workload on both cores as even orthos can't stress the chip beyond this-- that brings down the max temp signiificantly. I also found a couple of posts that said that core temps tend to be reading higher on the newer multi-core chips because of the more accurate internal sensors and that it's nothing to be alarmed about to see temperatures creeping beyong the 60 mark-- anyone have any comment on this?