Mailinglist Archive: opensuse (3031 mails)

[Aaron Kulkis <akulkis00@xxxxxxxxxx>]

Dave Plater wrote:
> Per Jessen wrote:
> > Per Jessen wrote:
> >
> >   
> > > I'm quite tempted to move the system outside tomorrow - in the early
> > > morning we're a couple of degrees below - with a huge external fan, I
> > > should be able to keep the whole thing _very_ cold.  Mind you, I will
> > > be disappointed if it then starts to work.  The amount of cooling I've
> > > got should be enough.
> > >     
> > OK, yesterday morning I moved the box outside, hooked it up with network
> > and power.  Outdoor temperature was -1C . 
> >
> > Temperature rose to about 6 in the afternoon, but the machine actually
> > ran pretty stable throughout the day.  I had one lockup which needed a
> > hard reset, but I haven't been able to reproduce that. 
> >
> > Whilst running 4 x mprime, the temperatures as seen by sensors
> > stabilised at this:
> >
> > work        System      CPU    temp3    Outdoor
> > 4 mprime        39       51       81          5
> > 4 mprime        35       50       80          6
> >
> > So it's all about cooling.  The interesting thing is - the machine uses
> > the AMD supplied CPU heatsink and fan.  It's got additional fans and
> > heatsinks to improve the air/heat flow.  How do I improve on the
> > cooling without looking at water-cooling and such? 
> >
> > Today I've removed the left cover and set up a large fan (similar to the
> > one shown in the picture on the right hand side here: 
> > http://en.wikipedia.org/wiki/Fan_%28mechanical%29)
> >
> > work        System      CPU    temp3       Room
> > 1 mprime        35       46       80         21
> > 2 mprime        35       51       81         21
> > 3 mprime        36       56       81         21
> > 4 mprime        38       60       81         21
> >
> >
> > Well - the system remains unstable and automatically reboots after a
> > while, maybe 10-15mins, of running 4 x mprime.  I've already got an
> > RMA# so I think this board is going back after all. 
> >
> >
> > /Per Jessen, Zürich
> >
> >   
> Can you still get peltier devices,

Or better yet -- DON'T!
Peltiers are only good in situations where you want to
use 2W of ADDITIONAL electricity consumption for every
1W used.

To cool his 95W Phenom would require an ADDITIONAL 180W
of power consumption by the Peltier cooler.

There's much more efficient ways of disippating 95W
of heat....You can get decent water-cooling with only
10-20W if you're willing to use an fanless external
tower radiator.

> they used to use them with early P1s
> and 486s. Their main use nowadays is in 12v cool boxes. They only have a
> 50% cooling efficiency so 100W of cooling takes 200W of power but they
> don't need all the pipes of a water cooled system.

And where would this peltier device be dumping that
300W of heat?...
Oh that's right ... the ambient air right around
the CPU and all the other heat-stressed components
like the north bridge chip, and disk drives.

Good idea -- NOT!

> Also a possibility that your vcore is too high,
> that causes excessive heat.

Very true.

and Overclocking is just begging for trouble
AND significantly shortened CPU life.

> Dave



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