2P-G865R - 2-Power - DDR3 - module

4 GB - DIMM 240-pin - 1333 MHz / PC3-10600 - CL9 - unbuffered - non-ECC - for Alienware X51; Dell Inspiron 660; OptiPlex 3010, 380, 390, 580, 780, 980, 990; Vostro 270