Reduce environmental impact and improve overall performance of ThinkCentre systems by upgrading with additional memory. PC3-8500 DDR3 UDIMM memory offers maximum data transfer rates up to 1066MB/sec 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 system performance and allows more multitasking which saves time and hassle. Compatible with ThinkCentre M58, M58p Small Form Factors (SFF's), Towers systems. Data transfer rates vary. Note: This memory is also available in single individual pack by ordering option part number: 45J5434.