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I think that you didn't turn off your card video onbard so you put your new card video in your computer, this reason brought into conflict.To solve this problem you should access into BIOS to disable your card video onboard.
you belived that your computer was slower when you upgraded your memory.In my view your computer may not suitable with your new memory.To solve this problem you should check your RAM's bus again.
Please contact me asap.
My English is very bad??
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