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Memory Subsystem Architecture
Memory Subsystem ArchitectureMemory Subsystem Architecture
Memory Subsystem Architecture
For maximum memory bandwidth, performance, and capacity, each Intel® Xeon® E7-2800/8867L and 6500/7500 series
processor socket contains two memory controllers. Each memory controller connects to two Intel® Scalable Memory Buffers (SMB)
for a total of four SMBs per processor. Each SMB connects to four RDIMMs for a grand total of sixteen RDIMMs per installed
processor (32 total RDIMMs per BL620c G7 server).
Maximum memory capacity is a function of the server model:
The BL620c G7 server models supporting Intel Xeon E7-2800/8867L processors includes the new Intel® 7510 Scalable
Memory Buffer supporting up to 32GB DDR3 RDIMMs providing 1.0TB of memory (32GB RDIMMs x 32 DIMM slots).
The BL620c G7 server models supporting Intel Xeon 6500/7500 processors support up to 16GB DDR3 RDIMMs providing
512MB of memory (16GB RDIMMs x 32 DIMM slots).
All RDIMMs will operate at the highest possible speed for a given processor. Memory speed is not affected by number of RDIMMs or
ranks. However, memory speed is a function of the processor QPI bus speed per the following:
Processors with a QPI speed of 6.40GT will operate memory at 1066MHz
Processors with a QPI speed of 5.86GT will operate memory at 978MHz
Processors with a QPI speed of 4.80GT will operate memory at 800MHz
DDR3 and DDR3L Memory Population Guidelines
DDR3 and DDR3L Memory Population GuidelinesDDR3 and DDR3L Memory Population Guidelines
DDR3 and DDR3L Memory Population Guidelines
An overview of the RDIMM installation guidelines are summarized below. For detailed memory configuration rules and guidelines,
please see the BL620c G7 user guide at:
www.hp.com/support
and the Online DDR3 Memory Configuration Tool at:
www.hp.com/go/ddr3memory-configurator
.
Install only HP BL620c G7 supported DDR3 and DDR3L RDIMMs.
RDIMMs must be installed for processor 1.
Populate RDIMM slots for a processor only if the processor is installed.
To maximize performance in multi-processor configurations, distribute the total memory capacity between all processors as
evenly as possible.
The minimum configuration is two RDIMMs installed on processor 1.
RDIMMs must be installed in pairs with identical characteristics. When possible, for configuration simplicity, HP recommends
using RDIMMs with identical part numbers throughout the system.
For best performance, HP recommends that RDIMM pairs be populated in sequence by letter designation. Install RDIMM pair
(4A, 5A) first, followed by RDIMM pair (12B, 16B), RDIMM pair (2C, 7C), RDIMM pair (10D, 14D), RDIMM pair (3E, 6E),
RDIMM pair (11F, 15F), and RDIMM pair (1G, 8G).
When installing mixed rank RDIMMs for any processor, RDIMMs with the highest number of ranks must be installed in the
white RDIMM connector locations. This guarantees proper electrical signaling on the DDR3 channel since RDIMMs with higher
rank counts present larger electrical loading on the DDR3 channel and must be populated at the end point of the channel.
1.5V DDR3 and 1.35V DDR3L RDIMMs may be installed within the same socket. In this case, all RDIMMs on that socket will
operate at 1.5V.
The BL620c G7 supports memory hemisphere mode (for a high-performance memory interleaving technology) as well as
several advanced memory modes (AMP) including advanced ECC, online spare, and mirrored memory. Please see the
BL620c G7 user guide at:
www.hp.com/support
for a description of each of these features and their memory configuration
guidelines.
There are several additional recommended steps for memory performance optimization, please see the BL620c G7 user guide
at:
www.hp.com/support
for a complete list.
Standard Memory
Standard MemoryStandard Memory
Standard Memory
32GB (4 x 8GB) of dual-rank DDR3-1066 RDIMMs (BL620c G7 Intel Xeon E7-2800/8867L models).
8GB (2 x 4GB) of dual-rank DDR3-1066 RDIMMs (BL620c G7 Intel Xeon 6500/7500 models).
Standard Memory Plus Optional Memory
Standard Memory Plus Optional MemoryStandard Memory Plus Optional Memory
Standard Memory Plus Optional Memory
QuickSpecs
HP ProLiant BL620c Generation 7 (G7) Server Blade
HP ProLiant BL620c Generation 7 (G7) Server BladeHP ProLiant BL620c Generation 7 (G7) Server Blade
HP ProLiant BL620c Generation 7 (G7) Server Blade
Memory
DA - 13747 Worldwide — Version 22 — March 6, 2012
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