HP ProLiant BL660c Gen8 Server Blade - Manual (Page 34)

Hardware options installation 34
DIMM type DIMM rank 1 DIMM per channel 2 DIMMs per channel
RDIMM (LV) Single-rank (4 GB) 1600 1600
RDIMM (STD) Single-rank (4 GB) 1866 1866
RDIMM (LV) Single-rank (8 GB) 1600 1600
RDIMM (STD) Single-rank (8 GB) 1866 1866
RDIMM (LV) Dual-rank (8 GB) 1600 1600
RDIMM (STD)
Dual-rank (8 GB) 1866 1866
RDIMM (LV) Dual-rank (16 GB) 1600 1600
RDIMM (STD) Dual-rank (16 GB) 1866 1866
LRDIMM (STD)
Quad-rank (32 GB) 1866 1866
HP SmartMemory
HP SmartMemory, introduced for Gen8 servers, authenticates and unlocks certain features available only on
HP Qualified memory and verifies whether installed memory has passed HP qualification and test processes.
Qualified memory is performance-tuned for HP ProLiant and BladeSystem servers and provides future
enhanced support through HP Active Health and manageability software.
Certain performance features are unique with HP SmartMemory. HP SmartMemory 1.35V DDR3-1333
Registered memory is engineered to achieve the same performance level as 1.5V memory. For example,
while the industry supports DDR3-1333 RDIMM at 1.5V, this Gen8 server supports DDR3-1333 RDIMM at
1.35V. This difference equates to up to 20% less power at the DIMM level with no performance penalty.
Memory subsystem architecture
The memory subsystem in this server blade is divided into channels. Each processor supports four channels,
and each channel supports two DIMM slots, as shown in the following table.
Channel Slot Slot number
1 A
E
1
2
2
B
F 3
4
3 C
G 8
7
4 D
H
6
5
For the location of the slot numbers, see "DIMM slot locations (on page 9 )."
This multi-channel architecture provides enhanced performance in Advanced ECC mode. This architecture
also enables the Lockstep memory mode.
DIMM slots in this server are identified by number and by letter. Letters identify the population order. Slot
numbers indicate the DIMM slot ID for spare replacement.
Single-, dual-, and quad-rank DIMMs
To understand and configure memory protection modes properly, an understanding of single-, dual-, and
quad-rank DIMMs is helpful. Some DIMM configuration requirements are based on these classifications.