i have this pc and the mother board is CN-0DN075-70821-79M-701G and it has core 2 duo e6420 2.13 ghz this board support 1066mhz and lga775 socket , can u tell me please which cpu i can upgrade beacuse i put 1066mhz cpu core 2 duo e7500 and didnt work and update the bios to the latest one 2.6.
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