Low 50's C for extended operation of pretty much all AMD chips. Stress testing will always push it higher, above 60 for any length of time at all is not good for business.
Unless it is a spare/old computer and you are just pushing for all you can get before it melts itself..
24/7 stable OC's, no more than 53-54 under heavy gaming conditions for reasonable chip life.
My experience with running the FX series (975 BE in my case), shows very little performance gain after a thermal ceiling in the above ranges is reached. A few percent higher benchmark is not worth nuking it.
That series of chips is FAR more responsive to opening up the Northbridge. 2600 NB is easily attainable, 2800 if you got a really good sample.
I ran my 975 BE at 4.1 Ghz / 2600 NB for over a year with no issues, aftermarket cooler on a Sabertooth 990fx board.
Then mailed it to a friend when I upgraded and he has been using it for 6 months.
Default NB is 2000. 2600 NB at stock clocks yields 25-30 ish percent gain in cpu thruput , usually with little or no increase in voltage. Which means little or no increase in heat over stock.
Visit the AMD overclocking thread here on Toms if you want to get the most out of it on a 24/7 OC. Most 955's will run 3.8/2600 all day long with good cooling, provided you have a good overclocking motherboard and perform a proper bios OC.
Use a Hyper 212 Evo at minimum or better cpu cooler with good case airflow before pushing it too hard.
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