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RE: Dell Optiplex 745 Mini Tower Upgrade

I have a question 
first of all thnx for your all answers very helpful. 
i have a Dell optiplex 745 mini tower and i want to know
which method ram memory is better to use
1.DDR2 SDRAM  533 or 667 MHz: 8 GB
2.800 MHz: 4 GB 

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