Improve overall performance of ThinkPad systems by upgrading with additional memory. PC2-5300 memory offers maximum data transfer rates up to 5300MB/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 notebook system performance and allows more multitasking which saves time and hassle. Compatible with ThinkPad R60 R61 R61e R61i SL300 SL400 SL500 T60 T60p T61 X60 X60s X60 Tablet X61 X61s X61 Tablet X300 Z60m Z60t Z61e Z61m and Z61t systems. (1)Data transfer rates vary. Test-proven 100% compatibility listed for supported ThinkPad systems.