The ThinkServer TD230 uses PC3-8500 DDR3, which operates at 1066 MHz. It can also accept PC3-10600 DDR3, which operates at 1333 MHz. ThinkServer TD230 RAM is available in a variety of sizes, ranging from single chips of 1 GB to 32 GB kits containing multiple pieces of memory. Servers use DIMM chips, which are affordable and easy to install. For questions regarding compatibility or for assistance ordering, please call 1-888-861-0328.