Lenovo 3633 Installation And Service Manual page 116

• 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.
• It is recommended to install DIMMs with the same rank in each channel.
• The following table lists the supported UDIMM population.
Table 25. Supported UDIMM population per channel
DIMM slots per
channel
2
2
• 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
4
• The following table shows the UDIMM memory installation sequence to optimize the system performance.
Table 27. DIMM installation sequence
Number of DIMMs
First pair of DIMMs
Second pair of DIMMs
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
Step 3. Remove the air baffle. See
Step 4. Locate the DIMM slots on the system board. Then, refer to
101 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.
Step 6. Open the retaining clips
Attention: To avoid breaking the retaining clips or damaging the DIMM slots, open and close the
clips gently.
Lenovo System x3250 M6 Installation and Service Guide
102
DIMMs installed in
DIMM type
each channel
1 Unbuffered DDR4
ECC
2 Unbuffered DDR4
ECC
DIMM type
Dual-rank UDIMMs
"Removing the server cover" on page
"Removing the air baffle" on page
on each end of the DIMM slot. Then, install the DIMM into the slot.
1
DIMM speed
2133/2400
2133/2400
Size
16 GB
Installation sequence (DIMM slots)
3, 1
4, 2
92.
93.
"Unbuffered DIMMs (UDIMMs)" on page
Ranks per DIMM
(any combination)
Dual-rank
Dual-rank
Total memory
64 GB