98 Installing System Components15 Turn on the system and attached peripherals.16 Test the drive by running system diagnostics (optional). See "Running theSystem Diagnostics" on page 181.System MemoryYour system supports DDR3 registered memory modules (RDIMMs) or ECCunbuffered memory modules (UDIMMs). Single and dual-rank memorymodules can be 1067- or 1333-MHz, and quad-rank memory modules can be800-MHz and 1067-MHz.The system contains eighteen memory sockets split into two sets of ninesockets, one set per each processor. Each nine-socket set is organized intothree DIMMs for each 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:• Single-rank and dual-rank RDIMMs of sizes 2-GB, 4-GB, and 8-GB(when available) are supported for a total of up to 144 GB.• Quad-rank RDIMMs are supported for a total of up to 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 or 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 within a memory channel(for example, 2-GB and 4-GB), but all populated channels must haveidentical configurations.
