Hardware options installation 40
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
).
Memory configurations
To optimize server availability, the server supports the following AMP modes:
• Advanced ECC—provides the greatest memory capacity for a given DIMM size, while providing up
to 4-bit error correction. This mode is the default option for this server.
• Lockstep—provides enhanced protection over Advanced ECC mode while continuing to make all
installed memory available to the operating system. The server can continue to function if a single- or
mulit-bit memory failure within a single DRAM device occurs.
• Online spare memory—provides protection against failing or degraded DIMMs. Certain memory is
reserved as spare, and automatic failover to spare memory occurs when the system detects a DIMM
that is degrading and receiving a high rate of correctable memory errors. This allows DIMMs that
have a higher probability of receiving an uncorrectable memory error (which would result in system
downtime) to be removed from operation.
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