Installing System Components 1194 Place the system upright on a flat, stable surface.5 Turn on the system and attached peripherals.System MemoryYour system supports DDR3 registered DIMMs (RDIMMs) or unbufferedECC DIMMs (UDIMMs). Single and dual-rank DIMMs can be 1067- or1333-MHz, and quad-rank DIMMs can be 1067-MHz.The system contains 8 memory sockets split into two sets of four sockets, oneset per each processor. Each four-socket set is organized into three channels.Two DIMMs for channel 0 and a single DIMM for channel 1 and 2. The firstsocket of each channel is marked with white release levers.The maximum memory that is supported on your system varies according tothe types and sizes of memory modules being used:• Single-rank and dual-rank RDIMMs of sizes 2-GB, 4-GB and 8-GB aresupported for a total of up to 64 GB.• Quad-rank RDIMMs are supported for a total of up to 64 GB.• 1-GB and 2-GB UDIMMs are supported for a total of up to 16 GB.General Memory Module Installation GuidelinesTo ensure optimal performance of your system, observe the following generalguidelines when configuring your system memory.NOTE: Memory configurations that fail to observe these guidelines can preventyour system from starting and producing any video output.• RDIMMs and UDIMMs cannot be mixed.• Except for memory channels that are unused, all populated memorychannels must have identical configurations.• In a dual-processor configuration, the memory configuration for eachprocessor must be identical.• Memory modules of different sizes can be mixed in A1-A4 or B1-B4(for example, 2-GB and 4-GB), but all populated channels must haveidentical configurations.• For Optimizer Mode, memory modules are installed in the numeric orderof the sockets beginning with A1 or B1.
