ThinkStation 1866MHz memory offerings let you upgrade your system's standard memory capacity to improve overall ThinkStation C30/S30/D30 system performance. Adding additional memory is a cost-effective way to help boost your system's performance and enhance its ability to run more programs simultaneously.20% more bandwidth over DDR3-1600 memory Consume the same power with DDR3-1600 memory Comes with ECC UDIMM and RDIMM with 4GB and 8GB density Test-proven 100% compatibility listed for supported systems Meets stringent Lenovo reliability standards for memory products Lenovo limited warranty Lenovo memory installed in a new Lenovo system automatically assumes system warranty.