Mailinglist Archive: opensuse (3031 mails)

[Aaron Kulkis <akulkis00@xxxxxxxxxx>]

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? 

I'm not satisfied with most factory-supplied heat-sinks.
They needs REALLY high fan speeds and so they have
to be noisy.

Get yourself one of those huge monstrosities with
3 to 6 heat sinks.  If you don't want to fool with the
hassle water cooling, but they are worth the bulk.
They also tend to have very large fans (90mm - 120mm),

This moves much more air with significantly lower
fan speeds (both RPMs and the even bigger noise
maker -- linear blade tip speeds).  Makers like Zalman
use quiet, durable ball bearings instead of noisy, cheap
and fast-wearing sleeve bearings.

> 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




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