Lenovo System x3850 X6 Installation And Service Manual page 63

• The server supports the following eXFlash DDR3 DIMMs:
Table 7. Supported eXFlash DDR3 DIMMs
SDRAM
Equiva-
Stor- lent
age Capacity
200 GB 8 GB
eXFlash
DIMM
400 GB 8 GB
eXFlash
DIMM
• Server models with the DDR3 compute book support 1.35-volt (low-voltage) registered DIMMs,
depending on the memory configuration settings in the Setup utility, it can also operate at 1.5-volt.
• Server models with the DDR4 compute book support 1.2-volt (low-voltage) registered DIMMs, depending
on the memory configuration settings in the Setup utility, it can also operate at 1.5-volt.
• Each compute book has four memory channels, eight DDR3 or DDR4 channels (two DDR3 or DDR4
channels per memory channel), and each DDR3 or DDR4 channel supports three DIMMs as shown in the
following illustration:
• When you replace a DIMM, the server provides automatic DIMM enablement capability without requiring
you to use the Setup utility to enable the new DIMM manually.
• The maximum operating speed of the server is determined by the slowest DIMM in the server.
• A minimum of one DIMM must be installed for each compute book. For example, you must install a
minimum of two DIMMs if the server has two compute books (one in each compute book). If you install
four compute books in the server, you must install a minimum of four DIMMs (one DIMM in each compute
book).
SDRAM
SDRAM
Equiva-
Equiva-
lent
lent
Density
Ranks
4 Gb 1R
4 Gb 1R
SDRAM
Equivalent
Organiza- Form
Voltage
tion factor
1024Mb x 4 DDR3 1.35V
low
profile
1024Mb x4 DDR3 1.35V
low
profile
Bandwidth
Type (MHz)
RDIMM 1600 MHz
RDIMM 1600 MHz
.
Chapter 2 Installing optional devices
49