v The server supports industry-standard double-data-rate 3 (DDR3), 800, 1066, or1333 MHz, PC3-10600R-999 (single-, dual-, or quad-rank), registered,synchronous dynamic random-access memory (SDRAM) dual inline memorymodules (DIMMs) with error correcting code (ECC). See http://www.ibm.com/servers/eserver/serverproven/compat/us/ for a list of supported memory modulesfor the server.v At least one DIMM must be installed for each installed microprocessor for theserver to operate, but three DIMMs per microprocessor improves serverperformance.v When two microprocessors are installed in the server, distribute the DIMMsbetween the two microprocessors to improve server performance.v The server supports a maximum of 16 single-, dual-, or quad-rank DIMMs. Themaximum number of quad-rank DIMMs the server supports is 12.v The memory controller has three registered DIMM channels per microprocessor(channels 0, 1, and 2). Channels 0 and 1 support three DIMMS, and channel 2supports two DIMMs.v Install DIMMs starting with the connector farthest from the microprocessor withineach channel.v When you install a quad-ranked DIMM in a channel with single- or dual-rankedDIMMs, install the quad-ranked DIMM in the connector farthest from themicroprocessor.v The server supports 1 GB, 2 GB, and 4 GB DIMMs, with a minimum of 2 GB anda maximum of 64 GB of system memory. (When 8 GB DIMMS are available, themaximum supported system memory will be 128 GB.)For 32-bit operating systems only: Some memory is reserved for varioussystem resources and is unavailable to the operating system. The amount ofmemory that is reserved for system resources depends on the operating system,the configuration of the server, and the configured PCI devices.62 IBM System x3500 M2 Type 7839: Installation and User’s Guide
