Dimm Identification; Memory Configurations - HP ProLiant BL420c User Manual

DIMM identification

To determine DIMM characteristics, use the label attached to the DIMM and the following illustration and
table.
Item Description
Size
1
Rank
2
Data width
3
Voltage rating
4
Memory speed
5
DIMM type
6
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 blade availability, the server blade 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 blade.
•
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
Definition
—
1R = Single-rank
2R = Dual-rank
4R = Quad-rank
x4 = 4-bit
x8 = 8-bit
L = Low voltage (1.35v)
U = Ultra low voltage (1.25v)
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)
Hardware options installation 31