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Download the package from http://ftp.twaren.net/Unix/NonGNU/dmidecode/ and install dmidecode,

tar -zxvf dmidecode-x.x.tar.gz
cd dmidecode-x.x
make
make install

To get the memory details, use,

dmidecode -t 2,16,17

Display SMBIOS/DMI information,

dmidecode -q