Lenovo System x3850 X6 Installation And Service Manual page 28

• Large system-memory capacity
The server supports up to 6 TB (models with DDR3 compute books) or 12 TB (models with DDR4 compute
books) of system memory.
– The DDR3 compute book memory controller supports error correcting code (ECC) for up to 96
industry-standard PC3-12800R 1600 MHz, PC3L-12800 1600 MHz, or PC3L-10600 1333 MHz Load
Reduced (LR), single-rank, dual-rank, or quad-rank, DDR3 (third-generation double-data-rate),
registered, synchronous dynamic random access memory (SDRAM) DIMMs.
– The DDR4 compute book memory controller supports error correcting code (ECC) for up to 96
industry-standard PC4-17000 2400 MHz, single rank x4, dual rank x4, quad rank x4, single rank x8,
dual rank x8, and quad rank x8 RDIMM configurations, DDR4 (fourth-generation double-data-rate),
registered, synchronous dynamic random access memory (SDRAM) DIMMs.
The server also supports 200 GB and 400 GB eXFlash™ DIMMs. You can use eXFlash DIMMs to utilize
unused DIMM slots to increase high performance storage capabilities. For additional information about
installing eXFlash DIMMs, see "eXFlash DIMMs" on page 50.
• Light path diagnostics
Light path diagnostics provides LEDs to help you diagnose problems. For more information about light
path diagnostics and the LEDs, see "LCD system information display panel" on page 27 and "Light path
diagnostics LEDs description" on page 159.
• Memory mirroring
Memory mirroring provides a redundant copy of all code and data that are addressable in the configured
memory map. Through the microprocessor memory controller chip set, memory mirroring replicates and
stores data across DIMMs on two or four memory channels simultaneously. If a failure occurs, the
memory controller switches from the DIMMs on the primary channel to the DIMMs on the backup channel.
To enable memory mirroring through the Setup utility, select System Settings → Memory → Memory
Mode → Mirroring. For information about installing DIMMs for memory mirroring, see "Memory mirroring"
on page 52 and "Installing a memory module" on page 46 for more information.
• Memory sparing
The server supports memory sparing. Memory sparing reserves memory capacity for failover in the event
of a DIMM failure, and the reserved capacity is subtracted from the total available memory. Memory
sparing provides less redundancy than memory mirroring does. If a predetermined threshold of
correctable errors is reached, the contents of the failing DIMM are copied to the spare memory, and the
failing DIMM or rank is disabled. To enable memory sparing through the Setup utility, select System
Settings → Memory → Memory Mode → Sparing. For information about installing DIMMs for memory
sparing, see "Memory rank sparing" on page 52.
• Mobile access to Lenovo Service Information Web page
The server provides a quick reference (QR) code on the system Service Card that you can scan with a
mobile device using a QR code reader application to get quick access to the Lenovo Service Information
Web page. The Service Information Web page provides additional information for parts installation and
replacement videos, and error codes for server support. For the location of the system Service Card and
QR code, see "QR Codes" on page 3.
• Multi-core processors
The server supports up to four Intel Xeon™ EX versions of the E7-48xx v2/v3/v4 or E7-88xx v2/v3/v4
Series, up to fifteen-core microprocessors (depending on the model). A base model of the server comes
with one compute book, all other modules come with two compute books. One microprocessor comes in
each compute book.
• Network support
The server comes with optional Ethernet adapters that supports dual-port 1 Gb and 10 Gb connections
and connection to a 10 Mbps, 100 Mbps, or 1000 Mbps network. For more information, see "Configuring
the Ethernet controller" on page 139.
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System x3850 X6 and x3950 X6 Installation and Service Guide