Lenovo System x3850 X6 - Page 63

• The server supports the following eXFlash DDR3 DIMMs:
Table 7. Supported eXFlash DDR3 DIMMs
Stor-
age
SDRAM
Equiva-
lent
Capacity
SDRAM
Equiva-
lent
Density
SDRAM
Equiva-
lent
Ranks
SDRAM
Equivalent
Organiza-
tion
Form
factor
Voltage
Type
Bandwidth
(MHz)
200 GB
eXFlash
DIMM
8 GB 4 Gb
1R 1024Mb x 4 DDR3
low
profile
1.35V RDIMM 1600 MHz
400 GB
eXFlash
DIMM
8 GB 4 Gb 1R 1024Mb x4 DDR3
low
profile
1.35V RDIMM 1600 MHz
• 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).
Chapter 2. Installing optional devices 49