Yea 70 imo is MAX a CPU should run, anymore and your risking a short life span (for your CPU of coarse ;) ). if your hitting 60 full load, you should be good.
Common misperception: All CPUs are the same.
Depending on manufacturer and application CPU temps can vary wildly. For example, the core i7: http://www.pugetsystems.com/blog/2009/02/26/intel-core-i7-temperatures/
From above source:
What we’ve found is that the Intel Core i7 CPUs throttle down their speed starting at 100C.
They go on to suggest going no higher than 80c max to give them some slack.
On the other hand, AMD processors run much cooler. The 1090t Thuban 3.2 has a max operating temperature of 62c [I don't have my source handy for this, but I triple checked it when I worked on my overclock--I'm running one ;) ]
As far as what temps you should be looking for [obviously cooler is better] you need to factor in CPU cooler [stock vs aftermarket vs water, etc] Computer case airflow [blow the dust out of your machine with compressed air, work on some good cable management] Ambient air temps, etc.
[edited because, until my new keyboard gets here, I'm stuck with what I have. . and it barely works >< ] Edited, Aug 17th 2010 11:44am by seneleron