512MB PC2-5300 CL5 NP DDR2 SDRAM UDIMM Fast Double Data Rate PC2-5300 memory offers maximum data transfer rates up to 5300MB/sec to help you increased performance of memory intensive applications such as steaming video, graphics and CAD programs. Adding more ThinkCentre memory is one of the least expensive ways to help boost overall desktop system performance and allows more multitasking which saves time and hassle.