Lenovo x3250 m6, Инструкция по установке и обслуживанию

Страница: 113 / 696

Unbuffered DIMMs (UDIMMs)
The following tips provide information that you must consider when you install UDIMMs.
• The memory channels run at the lowest common frequency of the DIMMs installed.
• The UDIMM options that are available for the server are 4 GB, 8 GB, and 16 GB DIMMs.
• The server supports up to two single-rank or dual-rank UDIMMs per channel.
• The following table lists the supported UDIMM population.
Table 25. Supported UDIMM population per channel
DIMM slots per
channel DIMMs installed in
each channel
DIMM type DIMM speed
Ranks per DIMM
(any combination)
2 1
Unbuffered DDR4
ECC
2133 Dual-rank
2 2 Unbuffered DDR4
ECC 2133 Dual-rank
• The following table lists the maximum DIMM population using ranked UDIMMs.
Table 26. Maximum memory population using ranked UDIMMs (depending on your model)
Number of UDIMMs DIMM type Size Total memory
4 Dual-rank UDIMMs 16 GB 64 GB
• The following table shows the UDIMM memory installation sequence to optimize the system performance.
Table 27. DIMM installation sequence
Number of DIMMs Installation sequence (DIMM slots)
First pair of DIMMs 3, 1
Second pair of DIMMs 4, 2
Installing a DIMM
To install a DIMM, do the following:
Step 1. Turn off the server. Then, disconnect all external cables and remove all peripheral devices.
Step 2. Remove the server cover. See “Removing the server cover” on page 88.
Step 3. Remove the air baffle. See “Removing the air baffle” on page 90.
Step 4. Locate the DIMM slots on the system board. Then, refer to “Unbuffered DIMMs (UDIMMs)” on
page 99 and ensure that you observe the installation rules and sequence.
Step 5. Touch the static-protective package that contains the DIMM to any unpainted metal surface on the
outside of the server. Then, remove the DIMM from the package.
Chapter 7
.
Removing and installing server components
99