Memory Option; Memory Overview; Low Voltage Dimms - HP ProLiant BL620c G7 User Manual

Memory option

Several DDR3 RDIMM option kits are available to expand server blade memory. The server blade supports
dual-rank and quad-rank DIMMs. Server blades using Intel® Xeon® E7 family processors support up to 1 TB
of memory using 32 x 32-GB DIMMs (16 DIMMs per processor). Server blades using Intel Xeon 6500 and
7500 series processors support up to 512 GB of memory using 32 x 16-GB DIMMs (16 DIMMs per
processor).
The server blade supports the following DIMM speeds:
•
Dual-rank PC3-10600 (DDR-1333) DIMMs operating up to 1066 MHz
•
Quad-rank PC3-8500 (DDR-1067) DIMMs operating up to 1066 MHz
Depending on the processor model, you can reduce the memory clock speed to 978 or 800 MHz. For more
information, see "Memory subsystem architecture (on page 39)."
NOTE:
protection beyond Advanced ECC. By default, the server is set to Advanced ECC Support. For
more information, refer to "HP ROM-Based Setup Utility (on page 68)."
For DIMM slot locations, see "DIMM slot locations (on page 12)."

Memory overview

The HP ProLiant BL620c G7 Server Blade is offered in two models, one that uses the Intel® Xeon® E7 family
processors, and the other that uses the Intel Xeon 6500 and 7500 series processors. The architecture of these
processors departs radically from previous Intel Xeon front-side-bus-based architectures.
In front-side bus architectures, the memory controller was incorporated in the northbridge, which produced
a common sharepoint for memory accesses for all processors. Similar to the dual-socket Intel Xeon 5500
processors, the Intel Xeon E7 family and 6500/7500 series processors employ a NUMA architecture. This
architecture incorporates QPI links for point-to-point connectivity between processors and provides dedicated
local memory for each processor.
To enable greater memory expansion capability, the DIMMs are not connected directly to the processor
through the memory controller. In the Intel Xeon E7 family and 6500 and 7500 memory subsystems, each
memory controller uses a dedicated Intel SMI to connect to an Intel SMB. The SMB is connected to two DDR3
memory channels that support four DIMM sockets.
To provide greater memory bandwidth over previous Intel Xeon multiprocessor architectures, each Intel Xeon
E7 family and 6500/7500 series processor includes two integrated memory controllers. Each memory
controller contains two SMIs. Therefore, four SMIs per processor connect to four SMBs. Because each buffer
supports 4 DIMM sockets, a single processor provides a total of 16 DIMMs. On server blades using Intel
Xeon E7 family processors, each DIMM can be up to 32 GB for 512 GB per processor (16 DIMMs x 32 GB).
On server blades using Intel Xeon 6500 and 7500 series processors, each DIMM may be up to 16 GB for
256 GB per processor (16 DIMMs x 16 GB).

Low Voltage DIMMs

In addition to standard 1.5V DDR-3 DIMMs, the HP ProLiant BL620c G7 Server Blade that uses the Intel Xeon
E7 family processors also supports 1.35V LV DIMMs in 8 GB, 16 GB, and 32 GB options. The LV DIMMs
save up to 15 to 20 percent per DIMM compared to using the standard 1.5V DIMMs. This savings is made
possible by the Model 7510 Intel SMB included on the HP ProLiant BL620c G7 Server Blade model that
The Advanced Memory Protection option in RBSU provides additional memory
Hardware options installation 36