Product guide

IBM System x3650 M4 14
Table 5. Maximum memory speeds (Part 2: HyperCloud DIMMs and LRDIMMs)
DIMM specification HyperCloud DIMM LRDIMM
Rank Dual rank Quad rank
Part number 00D5004 (32 GB) 00D4964 (16 GB) 90Y3105 (32 GB)
Rated speed 1066 MHz 1333 MHz 1333 MHz
Rated voltage 1.5 V 1.5 V 1.35 V
Operating voltage 1.5 V 1.5 V 1.35 V 1.5 V
Max. qty supported* 24 24 24 24
Max. DIMM capacity 32 GB 16 GB 32 GB 32 GB
Max. memory capacity 768 GB 384 GB 768 GB 768 GB
Max. memory
at rated speed
768 GB 384 GB 256 GB 512 GB
Maximum operating speed
1 DIMM per channel 1066 MHz 1333 MHz 1333 MHz 1333 MHz
2 DIMMs per channel 1066 MHz 1333 MHz 1066 MHz 1333 MHz
3 DIMMs per channel 1066 MHz 1333 MHz 1066 MHz 1066 MHz
* Maximum quantity supported is shown for two processors installed. When one processor is installed, the
maximum quantity supported is a half of the quantity that is shown. Shaded cells indicate when all DIMM sockets
can be occupied.
** NS = Not Supported
The following memory protection technologies are supported:
ECC

Chipkill (for x4-based memory DIMMs)

Memory mirroring

Memory rank sparing

If memory mirroring 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 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.