SKU :39M5797 MFG : IBM description:IBM 8GB (2X4GB) 2RX4 PC2-5300F MEMORY The IBM 39M5797 8GB DDR SDRAM memory module has a memory size of 8 GB and a memory technology of DDR SDRAM. _The number of modules is 2 x 4 GB with a memory speed of 667 MHZ, a memory standard of DDR2-667/ PC2-5300. The data integrity check is ECC Chip kill with a fully buffered signal processed. The products are Grade A system pulls which means they were pulled from a server but they have been tested and work. The latency timing is CL5. The form factor is 240-PIN. We offer same day ground shipping on orders over $50 within the 48 contiguous states, a one-year warranty, If you have any questions, feel free to chat with our web representative.