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The DS is a blower fan?Your card is a blower-type, with a limited exhaust (I looked at these a while back). Either it has a heat transfer issue likely due to a mounting problem, or it's not getting enough air; either way, try making sure that you have more air being pushed into the case than being pulled out, which will give the blower a chance.
As far as I know, that card has been known to be louder (than stock cooling) since it came out. There was a thread about it right away (the "HD" model).