This Toshiba® PA3677U-1M4G compatible 4GB DDR3-1066MHz Dual Rank Unbuffered 1.5V 204-pin CL7 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 memory allows you to have more programs open at a time
• DDR3-1066/PC3-8500 interface multiplexes 2-bit data from memory cell and I/O buses to minimize processor idle time and enhance your computer's performance
• Up to 1066 MHz speed is enough to run heavy software smoothly while surfing web with dozens of tabs open