XFX Ati Radeon 5850

i have a xfx ati radeon hd 5850 znfv. it is white screening black screened once, glitch's on desk top while moving windows and even at idle. i have an older board ASRock 939 socket and am stuck on how to down clock. i have read that this model is overclocked from factory and that if having problems like i am then just tune down the overclock ????????? im not sure.

Had computer running perfect with ati radeon x800 xl.
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  1. Try msi afterburner.
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