The HP ProLiant DL160 G5 features Intel�s latest Quad-Core Xeon processors and chipset, four drive bays and the high-efficiency options in a dense 1U form factor. This product is an affordable 1U, dual processor capable server equipped with essential performance features that provide customers with a platform to design a fully optimized solution. It is ideal for general purpose and high performance computing.Installation of the Hot Plug Backplane 1U 2S Kit (445985-B21) is required if ordering third or fourth Hard Drives for Hot Plug models only.