A few things that may be worth noting from me, as I also use an X800XT card.
One: I dont get a squealing from the vid-card when I play ANY games, even DW.
Two: My vid-card is liquid cooled. No on-card fan is present.
Three: ATI cards can, and will, change fan RPM's when air cooled to maintain temperature.
So, perhaps it is a combination of a junk stock fan, and the card keeping itself cool (or trying to)?
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