Lenovo ThinkServer RQ750
8
Table 3. Memory options
Part number
Description
Maximum supported
4X70F28588
Lenovo ThinkServer 4GB DDR4-2133MHz (1Rx8) RDIMM
32
4X70F28589
Lenovo ThinkServer 8GB DDR4-2133MHz (1Rx4) RDIMM
32
4X70G88323
Lenovo ThinkServer 8GB DDR4-2400MHz (1Rx4) RDIMM
32
4X70F28590
Lenovo ThinkServer 16GB DDR4-2133MHz (2Rx4) RDIMM
32
4X70G88324
Lenovo ThinkServer 16GB DDR4-2400MHz (2Rx4) RDIMM
32
4X70G88311
Lenovo ThinkServer 32GB DDR4-2133MHz (2Rx4) RDIMM
32
4X70G88322
Lenovo ThinkServer 32GB DDR4-2400MHz (2Rx4) RDIMM
32
The server supports RDIMMs. LRDIMMs and UDIMMs are not supported. It is supported to have both
2133 MHz-rated DIMMs and 2400 MHz-rated DIMMs installed in the same server.
The server supports 8 DIMMs when one processor is installed, 16 DIMMs when two processors are
installed, and 32 DIMMs when four processors are installed. Each processor has four memory channels,
and there are two DIMMs supported per channel.
The RQ750 supports up to 1024 GB of memory, at speeds up to 2133 MHz, when fully populated. The
actual memory speed in the system is determined by the lower of the memory speed supported by the
specific CPU or the maximum operating speed for the memory configuration that is based on the number
of DIMMs per channel.
The following memory protection technologies are supported:
•
ECC
•
Patrol Scrubbing
•
Demand Scrubbing
•
x4/x8 SDDC
The following RAS modes are supported:
•
Rank Sparing Mode
•
Mirroring Mode
•
Lockstep Mode
•
Independent mode (no RAS)
When you are using lockstep, sparing, or mirroring, the following memory population rules apply:
•
If memory mirroring or lockstep is used, DIMMs must be installed in pairs (minimum of one pair per
each CPU), and both DIMMs in a pair must be identical in type, size, and rank.
•
If memory sparing is used, one rank of a DIMM in each populated channel is reserved as spare
memory; therefore, Single Rank (1R) DIMMs cannot be used. DIMMs in a pair must be identical in
type, size, and rank.
Internal storage
The RQ750 supports the following drive bays:
•
Standard 8x 2.5-inch hot-swap drive bays supporting SAS/SATA HDDs or SSDs
•
Optional 4x 2.5-inch easy-swap drive bays supporting PCIe NVMe SSDs