On Fri, 29 Jan 1999, John R Pierce wrote:
> > > 3) The on-board ATI graphics chip is about 2 cm away from the Slot1,
> > > directly underneath the CPU's big heat sink.
> >
> > Hmmm, sounds pretty suspicious to me. I would move it down a slot or
> > two...
>
>
> "ON-BOARD" ATI graphics. its a all-in-one motherboard. can't move it.
EEEEEWWWWWWWW, that sounds like a poor design. I would notify the
manufacturer and solicit advice on creating some shielding.
> re: emf radiation, I heavily doubt that a CPU could radiate any significant
> EMF thru a heatsink, which after all is a large mass of aluminum, presumably
> grounded.
>
> I'd be more likely to suspect power transients coming through the +5VDC.
'tis possible, however there is a way to determine if and what is
emanating EMF. Take a length of fine wire preferably with shellac
insulation and coil it up about 1 inch in diameter(Probably 10-15 loops
should do) and connect the two ends to the probes on an oscilliscope (a
multimeter should do in a pinch). Replicate the problem on your monitor
and wave the coil over various components on your motherboard. You should
be able to "see" what is pumping out excessive EMF. Be careful you don't
touch the board with your coil :-)
>
> > > 4) The distributed.net client does not cause this behavior. My
> > > understanding is that it does not use either FPU or cache.
> >
> > Huh? If you are LL testing you are using FPU and cache. I'm almost as sure
> > that applies if you are factoring as well.
>
> he meant the distributed.net client does not use FPU or cache. In fact, it
> does use some cache, but not nearly as heavily as the LL tests do. The
> distributed.net client is that RC-5 encryption thing, its all integer math.
>
> -jrp
>
>
>
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