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Component identification 91
The memory subsystem may be populated with either RDIMMs or UDIMMs, but mixing the two types is not
supported. To determine DIMM characteristics, use the label attached to the DIMM and the following
illustration and table.
Item Description Definition
1
Size —
2
Rank 1R = Single-rank
2R = Dual-rank
4R = Quad-rank
3
Data width x4 = 4-bit
x8 = 8-bit
4
Memory speed 10600 = 1333-MHz
8500 = 1066-MHz
5
DIMM type R = RDIMM (registered)
E = UDIMM (unbuffered with ECC)
For the latest supported memory information, see the QuickSpecs on the HP website (http://www.hp.com).
System maintenance switch
The system maintenance switch (SW1) is a ten-position switch that is used for system configuration.
Position Description Function
S1
iLO security Off = iLO security is enabled.
On = iLO security is disabled.
S2
Configuration
lock
Off = System configuration can be
changed.
On = System configuration is
locked.
S3
Rack/Tower ID Off = Tower
On = Rack
S4
Reserved Reserved