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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