Lenovo HX3510-G Installation And Service Manual page 142

• Blank = 1.2 V specified
– wwwww is the DIMM bandwidth, in MBps
12800 = 12.80 Gbps (DDR4-1600 SDRAMs, 8-byte primary data bus)
14900 = 14.93 Gbps (DDR4-1866 SDRAMs, 8-byte primary data bus)
17000 = 17.00 Gbps (DDR4-2133 SDRAMs, 8-byte primary data bus)
19200 = 19.20 Gbps (DDR4-2400 SDRAMs, 8-byte primary data bus)
– m is the DIMM type
L = Load Reduction DIMM (LRDIMM)
R = Registered DIMM (RDIMM)
– aa is the CAS latency, in clocks at maximum operating frequency
– bb is the JEDEC SPD Revision Encoding and Additions level
– cc is the reference design file for the design of the DIMM
– d is the revision number of the reference design of the DIMM
Note: To determine the type of a DIMM, see the label on the DIMM. The information on the label is in
the format xxxxx nRxxx PC4v-xxxxxx-xx-xx-xxx. The numeral in the sixth numerical position indicates
whether the DIMM is single-rank (n=1), dual-rank (n=2), or quad-rank (n=4).
• The following rules apply to 2400 MHz DDR4 RDIMM speed as it relates to the number of RDIMMs in
a channel:
– When you install 1 RDIMM per channel, the memory runs at 2400 MHz
– When you install 2 RDIMMs per channel, the memory runs at 2400 MHz
– When you install 3 RDIMMs per channel, the memory runs at 1866 MHz
– All channels in a server run at the fastest common frequency
– Do not install registered and load reduction DIMMs in the same server
• The maximum memory speed is determined by the combination of the microprocessor, DIMM speed,
DIMM type, Operating Modes in UEFI settings, and the number of DIMMs installed in each channel.
• The server supports a maximum of 24 single-rank, dual-rank RDIMMs or 24 quad-rank LRIMMs.
• The following table shows an example of the maximum amount of memory that you can install using
ranked DIMMs:
Table 11. Maximum memory installation using ranked DIMMs
Number of DIMMs
24
24
24
• The RDIMM options that are available for the server are 16 GB, 32 GB and 64 GB. The server supports
a minimum of 64 GB and a maximum of 768 GB of system memory using RDIMMs or 1536 GB using
LRDIMMs.
Note: The amount of usable memory is reduced depending on the system configuration. A certain
amount of memory must be reserved for system resources. To view the total amount of installed memory
and the amount of configured memory, run the Setup Utility. For additional information, see "Configuring
the server" on page 34.
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HX3510-G, HX5510, HX5510-C, HX7510 Installation and Service Guide
DIMM type
Dual-rank RDIMMs
Dual-rank RDIMMs
LRDIMMs
DIMM size
16 GB
32 GB
64 GB
Total memory
384 GB
768 GB
1536 GB