User guide

Item Description Definition
x8 = 8-bit
4 Voltage rating L = Low voltage (1.35v)
U = Ultra low voltage (1.25v)
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)
H = HDIMM (HyperCloud)
For the latest supported memory information, see the QuickSpecs on the HP website (http://
h18000.www1.hp.com/products/quickspecs/ProductBulletin.html). At the website, choose the
geographic region, and then locate the product by name or product category.
Memory configurations
To optimize server availability, the server supports the following AMP modes:
●
Advanced ECC—provides up to 4-bit error correction and enhanced performance over Lockstep
mode. This mode is the default option for this server.
●
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. 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.
Advanced Memory Protection options are configured in RBSU. If the requested AMP mode is not
supported by the installed DIMM configuration, the server boots in Advanced ECC mode. For more
information, see "HP ROM-Based Setup Utility on page 86."
The server also can operate in independent channel mode or combined channel mode (lockstep).
When running in lockstep mode, you gain reliability in one of two ways:
●
If running with UDIMMs (built with x8 DRAM devices), the system can survive a complete DRAM
failure (SDDC). In independent channel mode, this failure would be an uncorrectable error.
●
If running with RDIMM (built with x4 DRAM devices), the system can survive the complete failure
of two DRAM devices (DDDC). Running in independent mode, the server can only survive the
complete failure of a single DRAM device (SDDC).
Table
5-1
Maximum capacity
DIMM type DIMM rank One processor Two processors
RDIMM Single-rank 96 GB 192 GB
RDIMM Dual-rank 192 GB 384 GB
42 Chapter 5 Hardware options installation