Very high readings of temperature CPU of the Mac Pro 8-core 2007

I have a Mac Pro 1.1 updated to level with two Intel Xeon X 5365 CPU and firmware 2.1. The system has worked very well for months. However, I'm worried about CPU temperature readings. Assuming that the readings are correct, I have no explanation for the difference in typical 30 degree Celsius between the processor and the heat sink.

Is it possible, that the CPU exceeds their life expectancy?

During a stress test, I can see the following typical readings:

CPU core 87 C / 189 F

CPU a heatsink 58 C / 136 F

B processor 91 c/196 F

CPU radiator B C 59/138 F

I use new thermal paste Arctic MX-2 and tried various measures, including polishing of the surface of the CPU and the heatsink using sandpaper grain 1000. Nothing has so far had no effect on temperature readings. There should be enough good contact between the heatsink and processor during the installation, because they stick well enough to remove the heatsink again.

Max TCASE. According to the operating temperature -1333 http://ark.intel.com/products/30702/Intel-Xeon-Processor-X5365-8M-Cache-3_00-GHz-MHz-FSB is 63 degrees Celsius.

According to http://www.intel.com/content/dam/doc/design-guide/5400-chipset-memory-controller-moyeu-guidelines.pdf the Quad-Core Intel® Xeon® 5300 series include a function of on-chip temperature sensor. The heat sink provided by Apple has a temperature sensor, which seems to be fixed directly on the coper plate that touches the CPU head spreader.

Given the following quote from the same document:

TIM's performance is sensitive to degradation (e.g. breakdown of fat) over the life of the processor because of the temperature of the phenomena of cycling. For this reason, measuring of the processor given TCASE value can decrease over time according to the type of material of TIM.

Anyone know if the IHS on the CPU is soldered or whether they used the thermal paste between the IHS and the die of a CPU? In the case, perhaps it could explain the current temperature readings.

Any ideas? Thank you!

Your temperatures look a bit high, but not outrageous. The temperature measured on the Silicon of heat will be always higher than the temperature measured on the radiator. That's what the radiator is supposed to do, leads away from the heat to the fins, which would measure even more cool.

Your Mac allows to adjust speed of the fans to the top in a loop of feedback, founded the temperature of these measures. You can place a floor under your minimum speeds of fans. This can be done with the tool similar to some tool you already use, like the SMC fan control.

If the processors to exceed their safe operation temperature, your Mac will perform a sudden uncontrolled power off.

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