Paul Derbyshire comments...
> John Pierce wrote...
> >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.
>
> Who said anything about "through the heat sink"?
> Fact is it isn't heat, since the vid problem shows up while the chip's
> still ice-cold to touch, and vanishes the instant prime95 stops without
> taking the time to wait for the fpu to cool down.
they specifically stated the ATI graphics chip was located half under the
CPU heat sink. Presumably, that would look something like this...
[bad ascii art alert]
||||
-------------------|||| <= Pentium-II SEC
-------------------||||
-------------------|*||
--heat sink--------|*|| <= * = P-II chip
-------------------|*||
-------------------|*||
-------------------|*||
-------------------||||
-------------------||||
||||
||||
===ATI SVGA CHIP=== ||||
=============motherboard===================
By EMF I meant electromagnetic interference, i.e. radio. Said heatsink
should act as a radio shield also and eliminate any inductive interference
with the ATI. Its my best guess that this effect is due to improperly
bypassed high frequency power supply transients.
-jrp
