overclocking causes graphics card to disappear

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10 Apr 2010
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on occaison, when i change a voltage setting or fsb setting, when i boot into windows the graphics card will have disappeared and the vgasave drivers are loaded, pci frequency is locked at 100mhz, i've checked all the settings and i am at a loss.

My pc specs are:

Q8200 @ 3.1ghz
corsair dominator 4gb 1066 ram
4850 radeon 512mb
gigabyte ga-ep45 ud3lr

any help would be great!
 
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