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Hardware options installation 46
DIMM type DIMM rank
1 DIMM
per
channel
—
2 DIMMs per
channel
—
3 DIMMs per
channel
—
UDIMM
Dual-rank (8GB) 1333 1600 1333† 1600 — —
* RDIMM supports 1.35V 3DPC at 1066. Third-party memory supports 1.5V 3DPC at 1066.
** LRDIMM enables 3 DIMMs per channel. HP SmartMemory supports up to 3DPC at 1066 at 1.35V. Third-party
memory supports 1.5V only.
† UDIMM is supported at 2DPC at 1333 using HP SmartMemory only. Third-party memory supports up to 2DPC at 1066.
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 up
to 3 DIMMs per channel at 1066 MT/s running at 1.35V. This equates to up to 20% less power at the DIMM
level with no performance penalty. In addition, the industry supports UDIMM at 2 DIMMs per channel at
1066 MT/s. HP SmartMemory supports 2 DIMMs per channel at 1333 MT/s, or 25% greater bandwidth.
Memory subsystem architecture
The memory subsystem in this server is divided into channels. Each processor supports four channels, and
each channel supports three DIMM slots.
Memory subsystem
channel
Population order
Slot number (Processor
2)
Slot number (Processor
1)
1
A
E
I
12
11
10
1
2
3
2
B
F
J
9
8
7
4
5
6
3
C
G
K
1
2
3
12
11
10
4
D
H
L
4
5
6
9
8
7
For the location of the slot numbers, see "DIMM slots (on page 13)."
This multi-channel architecture provides enhanced performance in Advanced ECC mode. This architecture
also enables Lockstep and Online Spare Memory modes.
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.