> > Sounds to me more like a "dirty" motherboard or power supply.
> Chances are
> > that the computer is emitting a lot of RF at high CPU load
> whether due to a
> > "dirty" (ie leaking) motherboard of a bad power supply. So I'd
> imagine it
> > doesn't satisfy some FCC Class whatever spec or something. I'd have Dell
> > replace the thing.
>
> As the original poster said, he's running on identical 16 Dell Optiplex
> systems, they ALL have this problem. This is a highly integrated business
> system with the graphics on the motherboard. There's no
> indication that the
> EMI is leaking from the case, indeed, the Optiplex cases that
> I've seen are
> very well shielded, with metal braid seals on all joints, etc.
So basically, it's just a poorly designed box. That's what you get for
buying Dell, but that's just my opinion :-)
If the problem were pervasive in many applications, I'd waste no time in
calling Dell and asking for a fix. As it is, if only FPU intensive apps
cause the problem, they probably wouldn't care.
Possible fixes: If it's a noisy power signal getting to the graphics chips,
too bad. If it's radiated interference, maybe some good copper braiding
around the CPU would help, tied to ground. Or around the graphics
circuitry. But again, if the problem is interference on the wiring, you're
SOL. Send 'em back and get Compaqs! :-)
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