Improve overall performance of ThinkPad systems by upgrading with additional memory. PC3-8500 DDR3-1066 low-halogen SODIMM memory offers maximum data transfer rates up to 1066MB/sec(1) to help you increased performance of memory intensive applications such as streaming video, graphics and CAD programs. Adding more system memory is one of the least expensive ways to help boost overall notebook system performance and allows more multitasking which saves time and hassle. (1)Data transfer rates vary.