Okay--now we're getting somewhere...I think.
Orthos/TAT/Pi/Prime95/etc. may be used to test or determine:
1) Stability of the overclocked chip/memory/system
2) Efficiency of the cooling system
But these programs probably will NOT indicate whether you are "stressing" your chip or in dangerous waters--if your system spends most of its day IDLE.
Now...if we can arrive within only 50% or 80/90% of our chip's actual temperature, then we really ought to prioritize the Delta (max-idle C) as the definition of 2) above.
I'm not sure if I will ever know the TRUE temperature of this chip, but I know that I've got a good (~67%), stable overclock on this chip and I believe it's safe (35C now as I type this, according to Speedfan).
Also, I just downloaded Everest--it matches my Speedfan temps, which in turn match my ASUS PC Probe II temps. Cool.
Also, Everest gave me this. I am VERY curious about the Maximum clock value.
Version Intel(R) Core(TM)2 CPU 4300 @ 1.80GHz
Serial Number To Be Filled By O.E.M.
Asset Tag To Be Filled By O.E.M.
Part Number To Be Filled By O.E.M.
External Clock 334 MHz
Maximum Clock 3800 MHz
Current Clock 3006 MHz
Type Central Processor
Voltage 1.4 V
Socket Designation Socket 775
Late. Tired. Bed.