HP ProLiant BL680c Specification page 27

QuickSpecs
Memory
Memory Subsystem Architecture
For maximum memory bandwidth, performance, and capacity, each 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 grand total of sixteen RDIMMs per installed processor (64 RDIMMs total per BL680c G7 server) providing up to 2.0TB of
memory (32GB RDIMMs x 64 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 processors 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
An overview of the RDIMM installation guidelines are summarized below. For detailed memory configuration rules and guidelines,
please see the BL680c G7 user guide at:
www.hp.com/go/ddr3memory-configurator
1. Install only HP BL680c G7 supported DDR3 and DDR3L RDIMMs.
2. RDIMMs must be installed for processor 1.
3. Populate RDIMM slots for a processor only if the processor is installed.
4. To maximize performance in multi-processor configurations, distribute the total memory capacity between all processors as
evenly as possible.
5. The minimum configuration is two RDIMMs installed on processor 1.
6. 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.
7.
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).
8.
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.
9. 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.
10. The BL680c 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 BL680c G7 user
guide at: www.hp.com/support
11. There are several additional recommended steps for memory performance optimization, please see the BL680c G7 user guide
at: www.hp.com/support
Standard Memory
64GB (8 x 8GB) of dual-rank DDR3-1066 RDIMMs
Standard Memory Plus Optional Memory
Up to 1.8TB of memory is available with the installation of optional DDR3 RDIMM memory expansion kits
Standard Memory Replaced with Optional Memory
Up to 2.0TB of memory is available with the removal of standard memory and the installation of optional DDR3 RDIMM memory
expansion kits
www.hp.com/support
for a description of each of these features and their memory configuration guidelines.
for a complete list.
DA - 13742 North America — Version 35 — December 13, 2013
HP ProLiant BL680c Generation 7 (G7) Server Blade
and the Online DDR3 Memory Configuration Tool at:
Page 27