Lexmark X Series Printer Memory Upgrade Configurator - choose your Model:

X463DE Series
X464DE Series
X466DE Series
X466DTE Series
X466DWE Series
X543DN Series
X544DW Series
X544N Series
X560N Series
X651DE Series
X652DE Series
X654DE Series
X656DE Series
X658DE Series
X734DE Series
X736DE Series
X738DE Series
X738DTE Series
X850E VE3 Series
X850E VE4 Series
X852e Series
X854e Series
X860de 3, 4 Series
X862dte 3, 4 Series
X864dhe 3, 4 Series
X940e Series