MacPro CPU temperature after Snow Leopard

Macpro, quadquore nehalem (1 cpu).

With The 10.5 (leopard), the "Temperature Monitor" usually hung around
60 to 70°C for the CPU.

After upgrading to Snow Leopard, and installing the latest version of
Teperature Monitor 4.8 and booting 64 bit kernel, the CPU temperatuer
now hangs around 30°.

Running VLC with a 1080p movie, I got the CPU to rise to 62° And once I
quit, it started to drop down again.


Is it possible that Snow Leopard makes better use of CPU "throttling" to
save energy (and thus generate less heat), or is this more of an
instrumentation issue with either Snow Leopard or Temperature Monitor
reporting temperature incorrectly/differently ?

The sensor I monitor is CPU A diode.

In article <006111e7$0$7055$>,
JF Mezei <> wrote:

> Macpro, quadquore nehalem (1 cpu).
>
> With The 10.5 (leopard), the "Temperature Monitor" usually hung around
> 60 to 70°C for the CPU.
>
> After upgrading to Snow Leopard, and installing the latest version of
> Teperature Monitor 4.8 and booting 64 bit kernel, the CPU temperatuer
> now hangs around 30°.
>
> Running VLC with a 1080p movie, I got the CPU to rise to 62° And once I
> quit, it started to drop down again.
>
>
> Is it possible that Snow Leopard makes better use of CPU "throttling" to
> save energy (and thus generate less heat), or is this more of an
> instrumentation issue with either Snow Leopard or Temperature Monitor
> reporting temperature incorrectly/differently ?
>
> The sensor I monitor is CPU A diode.

30 seems abnormally low, but it's what mine is saying too. Let me check
with an IR thermostat...

Mac says -
Ambient: 23
CPU: 30

IR thermostat says -
Door : 23.6
CPU : 30.8

I guess it's correct.
--
I won't see Goolge Groups replies because I must filter them as spam

On Nov 3, 12:47*am, Kevin McMurtrie <kevin...@sonic.net> wrote:
> In article <006111e7$0$7055$c3e8...@news.astraweb.com>,
> *JF Mezei <jfmezei.spam...@vaxination.ca> wrote:
>
>
>
>
>
> > Macpro, quadquore nehalem (1 cpu).
>
> > With The 10.5 (leopard), the "Temperature Monitor" usually hung around
> > 60 to 70°C for the CPU.
>
> > After upgrading to Snow Leopard, and installing the latest version of
> > Teperature Monitor 4.8 and booting 64 bit kernel, the CPU temperatuer
> > now hangs around 30°.
>
> > Running VLC with a 1080p movie, I got the CPU to rise to 62° And onceI
> > quit, it started to drop down again.
>
> > Is it possible that Snow Leopard makes better use of CPU "throttling" to
> > save energy (and thus generate less heat), or is this more of an
> > instrumentation issue with either Snow Leopard or Temperature Monitor
> > reporting temperature incorrectly/differently ?
>
> > The sensor I monitor is CPU A diode.
>
> 30 seems abnormally low, but it's what mine is saying too. *Let me check
> with an IR thermostat...
>
> Mac says -
> Ambient: 23
> CPU: 30
>
> IR thermostat says -
> Door : 23.6
> CPU : 30.8
>
> I guess it's correct.
> --
> I won't see Goolge Groups replies because I must filter them as spam

I have the first Gen Mac Pro, by ambient is also 23, the CPU heat
sink is also 30, my CPU cores are between 32 and 34.

Updated to 4.8, same thing....

Strange... Yesterday, I had noticed the temperature staying at roughly
30° when idle, but today, the temperarture stayed at about 64° when idle.

Perhaps there is some adaptive stuff happening with the Temperature
Monitor software. (have not rebooted the machine).