> Greg, what was the average temp after you put the plumbers putty in ?
>
> I was considering overclocking a duo and putting in one of those
> bat-wing heat sinks the 2300 uses.
>
> I also notice that the magnesium frame doesnt dissipate heat as well
> as I would of hoped. Maybe if you could copper plate part of the
> frame around the CPU it would transfer heat better. Rats, what the
> heat conductance of Mg anyway ? I should look that up at work.
>
> Mad Dog
>
> ------------------------------
>
I just started an experiment. I have two 280c duo's and I just booted
them both up and am running the same program on both of them
(Oscilloscope 2.1) and also am running DuoMon on both of them so I can
see the temperatures at a glance. Both are running 7.6.1 and have the
Powerbook Control panels set the same...Never Sleep and Never Dim and
checked Allow Processor Cycling. But I am letting the drives spin down.
Duo #1 has 16m ram and plumbers putty between the stiffener and chip.
Duo #2 has 40m ram and factory heat sink pad between the stiffener and chip.
Both are running from an AC adapter, not battery, except for a few
minutes I run them on battery so I could see how many watts they were
using (via DuoMon). Both are sitting on the same table about 6 inches
apart and neither is near any other heat producing devices nor are there
any noticeable drafts in the room. Both batteries were fully charged at
the beginning of test, but about 15 minutes into the test I removed both
batteries in case one of the machines decided to add a little "top off"
charge and thus heat itself a bit more than the other.
Interestingly, Duo #1 is using 11.23 watts while #2 is using 10.89. I
tried switching batteries and they still showed very close to the same.
The only thing that I can think that might cause this is that I recently
put a new CCFL (fluorescent lamp) in the display of #2. Maybe it somehow
draws slightly less power although a fluorescent lamp's current should
be governed by its source I believe. Or maybe it is a variation in the
devices that detects the current flow. Don't know where/how that occurs.
I might add that when I am online using Netscape with one of the 280c's
the power being used averages about 9.5 to 10 watts. This is with the
drive spun down some of the time, but the modem on full time and the
screen on dim.
Ok, the test results are in... one hour and 15 minutes has passed with
the two 280c's each using about 11 watts and (drum roll please....) Duo
#1 (plumbers putty) is running a temp of 98 F while Duo #2 (factory
heatsink foam pad) is simmering along at 100 F. I just rechecked the
power usage and #1 is still about 11.3 watts while #2 is slightly less
at 10.9 watts. So there you have it. The plumbers putty seems to be
doing as well (better actually) as the factory foam.
Greg
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