Meanwhile TJMax is associated with the processor announced TDP (Thermal design power). Essentially TDP determines how much electric heat it can dissipate without exceeding TJMax by using the stock active cooling mechanism. Modern processors, on the case of Intel especially those around the Nehalem architecture, have comparably high TDPs while coming (particularly those of this architecture with the 45nm manufacturing process and better) with very low power requirements. This is exactly what gives these processors their overclocking headroom. So safe in fact that the days of water cooling are now reserved only to extreme OCing.
The Nehalem architecture and the new manufacturing processes (45nm and better) have really reshaped OCing as you used to know it. Meanwhile, failsafe mechanisms like throttling and therm-trip have made it actually more difficult for you to melt a CPU.
I'm not sure I understand. But for my CPU I have in fact 5 independent and differently placed temp readouts. One for each core and the fifth one... I'm not sure where exactly. On my case you could even sort of consider a 6th one, since the motherboard sensor is placed under the CPU.Ok... bo back to my first message on this and re-read the part about temperature gradients. You can have a tjMax - 30 reading at the sensor but at some point away from the sensor you might actually be getting very close to the limit unless your cooling solution is adequate to keep the whole chip evenly warm. (As I pointed out before, this is an artifact of single sided cooling...)
I think this layout is pretty standard these days.