This Lenovo 51J0493 compatible 4GB DDR3-1333MHz Dual Rank Unbuffered 1.5V 204-pin CL9 SODIMM is 100% guaranteed to be compatible with your system and to work right the first time. Adding additional memory is the best way to increase the performance of your system. All our memory is built to strict JEDEC standards to meet or exceed the Tier 1 OEM's factory requirements. Our products are also guaranteed by federal law to not affect or void OEM warranties.

• 4 GB of memory to refine your computer's performance
• DDR3 SDRAM interface multiplexes 2-bit data from memory cell and I/O buses to minimize processor idle time and enhance your computer's performance
• No matter how heavy and numerous the applications that you are using, 1333 MHz memory speed with Unbuffered signal and CL9 latency will run them smoothly