High Pitched Whine

[Stephen Montgomery-Smith]

This reply probably is unrelated to your problem as well as smp, but I 
had a dual AMD processor which I gave a very cpu intensive numerical 
computation, taking about one second to do one loop, and several days to 
do the whole thing.  You could literally hear it do the computations, 
with a high pitched whine just as you described, but with a one second 
beat to it.

Stephen