This IBM® RedpaperTM publication is a comprehensive guide covering the IBM Power System S812L (8247-21L) and IBM Power System S822L (8247-22L) servers that support the Linux operating system (OS). The objective of this paper is to introduce the major innovative Power S812L and Power S822L offerings and their relevant functions: The new IBM POWER8TM processor, available at frequencies of 3.02 GHz, and 3.42 GHz Significantly strengthened cores and larger caches Two integrated memory controllers with improved latency and bandwidth Integrated I/O subsystem and hot-pluggable Peripheral Component Interconnect Express (PCIe) Gen3 I/O slots Improved reliability, serviceability, and availability (RAS) functions IBM EnergyScaleTM technology that provides features such as power trending, power-saving, capping of power, and thermal measurement This publication is for professionals who want to acquire a better understanding of IBM Power SystemsTM products. This paper expands the current set of IBM Power Systems documentation by providing a desktop reference that offers a detailed technical description of the Power S812L and Power S822L server. This paper does not replace the latest marketing materials and configuration tools. It is intended as an additional source of information that, together with existing sources, can be used to enhance your knowledge of IBM server solutions.