CPU temp's on core 2 duo, should they be significantly different?

George Hartzell hartzell at alerce.com
Mon Jun 23 20:52:08 UTC 2008


Josh Carroll writes:
 > [...]
 > I'd recommend taking the heat sink off and seeing how the thermal
 > grease is spread on the CPU's head spreader and on the heatsink
 > itself. If it looks lopsided or extremely thick on one side of the CPU
 > package or extremely thin (to the point where you can still see the
 > sheen of the heatsink or heat spreader), then re-mount the heatsink
 > and try to make sure it's evenly distributing the pressure down on the
 > CPU package.

This is a Shuttle XPC box.  I pulled the heatsink/cooler assembly and
there didn't seem to be any obvious asymmetries in how the the grease
was distributed.  I swirled it around a bit, reassembled, and am
seeing the same kind of spreads.

Here's the machine pretty much idle 

  dev.cpu.0.temperature: 44
  dev.cpu.1.temperature: 28

Where top says:

  last pid:  1217;  load averages:  0.02,  0.51,  0.43            up 0+00:14:57  13:49:47
  52 processes:  1 running, 51 sleeping
  CPU:  0.0% user,  0.0% nice,  0.0% system,  0.2% interrupt, 99.8% idle
  Mem: 22M Active, 13M Inact, 95M Wired, 1788K Cache, 15M Buf, 3797M Free
  Swap: 4063M Total, 4063M Free

A could of dd if=/dev/urandom etc... quickly pushes it up, but the
delta remains:

  dev.cpu.0.temperature: 51
  dev.cpu.1.temperature: 39

Top says:

  last pid:  1243;  load averages:  0.98,  0.65,  0.48            up 0+00:16:07  13:50:57
  54 processes:  3 running, 51 sleeping
  CPU:  0.4% user,  0.0% nice, 92.5% system,  0.0% interrupt,  7.1% idle
  Mem: 22M Active, 13M Inact, 95M Wired, 1788K Cache, 15M Buf, 3797M Free
  Swap: 4063M Total, 4063M Free

g.


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