116 Installing System ComponentsSystem 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 12 memory sockets split into two sets of six sockets, oneset per each processor. Each six-socket set is organized into three channels oftwo memory sockets per channel. The first socket of each channel is markedwith white release levers.The maximum memory that is supported on your system varies according tothe types and sizes of memory modules being used:• RDIMMs of sizes 2-GB, 4-GB, and 8-GB are supported for a total of upto 96 GB.• 1-GB and 2-GB UDIMMs are supported for a total of up to 24 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.• In a dual-processor configuration, the memory configuration for eachprocessor must be identical• For Optimizer Mode, memory modules are installed in the numeric orderof the sockets beginning with A1 or B1.• For Memory Mirroring or Advanced ECC Mode, the three sockets furthestfrom the processor are unused and memory modules are installedbeginning with socket A2 or B2 and proceeding in the following order: A2,A3, A5, and A6).• Advanced ECC Mode requires x4 or x8 DRAM device widths.• The memory speed of each channel depends on the memoryconfiguration:– For single or dual-rank memory modules:• One memory module per channel supports up to 1333 MHz.
