x1800xt 3d fault ? help

space1471

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Jul 6, 2006
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I have a just built new a new pc. p4 D805,2mg ram,asus p5wd-e mb,hiper psu.
with a x1800xt 512. but every time i run a 3d program it has a high pitch constant beeb. i can run system at full load with prime95 and rightmark cpu test at same time stable and 50 degrees .
but any 3d test such as 3dmark06 results in beeeeep.. it will complete with comparable score to database. but does anyone know if beep is a faulty card.
have tried 2 original and latest drivers.