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Originally Posted by Jammer
What may be producing the latter is the switching-mode inverter present in his power supply. Cheap inverters can produce a high-pitched squeel when operating at high frequencies.
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Video cards also have a number of inverters on them - especially those with power supply connections. Have a whole battery of power circuits, mosfets, etc
I think it's *that* area of the video card that the squeal is coming from, but why DW and DW alone (and only when no FSAA is applied) would be causing that ridiculous squeal is a curious thing.
(FWIW, I did put the other card in and verified that 4xFSAA fixes that one, too. Must have had something funny with the drivers the last time I had it in, but it's confirmed that 4xFSAA fixes both cards I have, while both squeal with no AA on. Too bad AA doesn't work properly in DW.)