Lenovo ThinkSystem SR630 Product Manual page 27

Configuration note: If processors with 200 W or 205 W TDP are used, the following conditions must be met:
No drive backplanes installed (M.2 drives are supported)
No rear HDD kit installed
No PCIe flash adapters installed
No GPUs installed
ASHRAE A2 (35°C [95 °F]) only; no fan failure support
Memory
The SR630 server supports up to 12 TruDDR4 memory DIMMs with one processor and up to 24 DIMMs when
two processors are installed. Each processor has six memory channels, and there are two DIMMs per channel.
Lenovo TruDDR4 memory uses the highest-quality components sourced from Tier 1 DRAM suppliers and only
memory that meets strict requirements is selected. It is compatibility tested and tuned on every ThinkSystem
server to maximize performance and reliability.
TruDDR4 memory has a unique signature programmed into the DIMM, which enables Lenovo servers to verify
whether the memory installed is qualified and supported. Lenovo qualified and supported TruDDR4 memory is
covered by Lenovo warranty, and service and support provided worldwide.
The following rules apply when selecting the memory configuration:
The server supports RDIMMs, LRDIMMs, or 3DS RDIMMs.
Mixing different types of memory (RDIMMs, LRDIMMs, and 3DS RDIMMs) is not supported.
Mixing x4 and x8 RDIMMs and RDIMMs of different capacity is supported.
All DIMMs in the server operate at the same speed up to 2666 MHz, which is determined by the maximum
memory speed supported by the specific processor.
Note: Maximum memory speed can be achieved when Max performance mode is enabled in UEFI.
The following maximum memory capacities supported by the server:
RDIMMs: 768 GB (384 GB per processor).
LRDIMMs: 1.5 TB (768 GB per processor).
3DS RDIMMs: 3 TB (1.5 GB per processor) (requires processors that support 1.5 TB of memory
per socket).
The following memory protection technologies are supported:
ECC
SDDC (for x4-based memory DIMMs)
ADDDC (for x4-based memory DIMMs; Gold and Platinum processors only)
Memory mirroring
Memory rank sparing
Patrol scrubbing
Demand scrubbing
Single Device Data Correction (SDDC) works only in the independent channel mode (the default operational
mode) and supports only x4-based memory DIMMs.
Adaptive Double Device Data Correction (ADDDC) works with x4-based memory DIMMs and requires two
DIMM ranks per channel, Intel Xeon Gold or Platinum processors, and the Closed Page memory access mode.
If memory mirroring is used, then DIMMs must be installed in pairs (a minimum of one pair per each processor),
and both DIMMs in a pair must be identical in type and size.
If memory rank sparing is used, then a minimum of one quad-rank DIMM or two single-rank or dual-rank DIMMs
must be installed per populated channel (the DIMMs do not need being identical). In rank sparing mode, one rank
of a DIMM in each populated channel is reserved as spare memory. The size of a rank varies depending on the
DIMMs installed.
SDDC, memory mirroring, and memory rank sparing modes are mutually exclusive. Only one operational memory
mode can be enabled on the server, and it is a system-wide setting.
Lenovo ThinkSystem SR630 Server 27