Dimm identification, Memory protection modes – HP ProLiant SL250s Gen8 Server User Manual
Page 40
Hardware options installation 40
DIMM identification
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
3R = Three-rank
4R = Quad-rank
3
Data width
x4 = 4-bit
x8 = 8-bit
4
Voltage rating
L = Low voltage (1.35V)
U = Ultra low voltage (1.25V)
Blank or omitted = Standard
5
Memory speed
14900 = 1866-MT/s
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)
Memory protection modes
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
memory mode. This mode is the default option for the 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