HP ProLiant DL388e HP ProLiant DL388e Gen8 Server User Guide - Page 59

DIMM identification, Single-rank and dual-rank DIMMs, Aspect, Definition

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DIMM identification To determine DIMM characteristics, use the label attached to the DIMM and the following illustration and table. Item Aspect 1 Size 2 Rank 3 Data width 4 Voltage rating 5 Memory speed 6 DIMM type Definition - 1R = Single rank 2R = Dual rank 4R = Quad rank x4 = 4 bit x8 = 8 bit L = Low voltage (1.35 V) U = Ultra low voltage (1.25 V) Blank or omitted = Standard 12800 = 1600 MT/s 10600 = 1333 MT/s 8500 = 1066 MT/s R = RDIMM (registered) E = UDIMM (unbuffered with ECC) L = LRDIMM (load reduced) For the latest supported memory information, see the QuickSpecs on the HP website (http://www.hp.com). Single-rank and dual-rank DIMMs DIMM configuration requirements are based on these classifications: • Single-rank DIMM-One set of memory chips that is accessed while writing to or reading from the memory. • Dual-rank DIMM-Two single-rank DIMMs on the same module, with only one rank accessible at a time. The server memory control subsystem selects the proper rank within the DIMM when writing to or reading from the DIMM. Hardware options installation 59

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Hardware options installation 59
DIMM identification
To determine DIMM characteristics, use the label attached to the DIMM and the following illustration and
table.
Item
Aspect
Definition
1
Size
—
2
Rank
1R = Single rank
2R = Dual rank
4R = Quad rank
3
Data width
x4 = 4 bit
x8 = 8 bit
4
Voltage rating
L = Low voltage (1.35 V)
U = Ultra low voltage (1.25 V)
Blank or omitted = Standard
5
Memory speed
12800 = 1600 MT/s
10600 = 1333 MT/s
8500 = 1066 MT/s
6
DIMM type
R = RDIMM (registered)
E = UDIMM (unbuffered with ECC)
L = LRDIMM (load reduced)
For the latest supported memory information, see the QuickSpecs on the HP website (
).
Single-rank and dual-rank DIMMs
DIMM configuration requirements are based on these classifications:
•
Single-rank DIMM—One set of memory chips that is accessed while writing to or reading from the
memory.
•
Dual-rank DIMM—Two single-rank DIMMs on the same module, with only one rank accessible at a time.
The server memory control subsystem selects the proper rank within the DIMM when writing to or reading
from the DIMM.