i5-3320M uneven core temperatures.

[krotuss]

Hi,

I am observing uneven core temperatures, both at idle and load:

idle ~22°C amb air:

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Adapter: ISA adapter
Package id 0:  +46.0°C  (high = +87.0°C, crit = +105.0°C)
Core 0:        +46.0°C  (high = +87.0°C, crit = +105.0°C)
Core 1:        +40.0°C  (high = +87.0°C, crit = +105.0°C)

load (make -j4) ~22°C amb air:

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coretemp-isa-0000
Adapter: ISA adapter
Package id 0:  +65.0°C  (high = +87.0°C, crit = +105.0°C)
Core 0:        +65.0°C  (high = +87.0°C, crit = +105.0°C)
Core 1:        +57.0°C  (high = +87.0°C, crit = +105.0°C)

I have just re-pasted my heatsink so I am bit worried if there may be something wrong with that. Unfortunately I don't have reference from before re-paste. Also I find strange that core 1 is lower than the package and core 0 and package are really close together (both at idle and load). I assume that these sensors are directly on silicon so it should not be miss-wired/labeled, or am I wrong?

[eccerr0r]

Package temperature is a weighted average of the cores and isn't a real sensor and probably is weighted towards a much hotter core. Core temperatures are on-die.

Most of my cpus the cores are fairly close though it depends on core scheduling (whether you specified processes should be locked to core) and yeah whether your heat spreader/thermal solution is proper. The heat spreader should handle most of the difference but it's possible you have an air bubble near core 0.

That being said, 65°C under load is still in the safe zone. I have two machines run in the 80°C range under load ...