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RAM issue with Dell XPS 1640

I have this laptop from 2009 N07X1604 STUDIO XPS 16 : INTEL CORE 2 DUO T9900(3 MEMORY : 4096MB (2X2048) 1067MHZ DDR3 DU As you see, it comes with 2 modules of 2gb 1067MHZ DDR3. Now I have searched ...