The product line includes 2U, 3U, and 4U form factors, with each server capable of supporting up to 7 PCI expansion slots and Supermicro's wide line of DP and UP motherboards. Offering up to 95% power efficiency, cooling redundancy, power redundancy, hot-swappable drive bays and fans, Supermicro storage servers are designed to meet the requirements of today's sophisticated enterprise data centers and high performance applications with new levels of storage performance, scalability and reliability. Direct attached HDD backplane (E16 version) and expander backplane (E1 and E2 versions) are available for application-specific solution optimization.