AddOn AM1333D3DRE/4G x1 HP NL797AA Compatible Factory Original 4GB DDR3-1333MHz Unbuffered ECC Dual Rank 1.5V 240-pin CL9 UDIMM - 100% compatible and guaranteed to work

Up to 1333 MHz speed for playing the latest games and using heavy software 4 GB memory allows you to have more programs open at a time DDR3 SDRAM interface multiplexes 2-bit data from memory cell and I/O buses to minimize processor idle time and enhance your computers performance