HP Rp5700 HP rp5700 Business System Service Reference Guide, 1st Edition - Page 80

Populating DIMM Sockets, labeled DIMM 1, DIMM 2

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Populating DIMM Sockets There are four DIMM sockets on the system board, with two sockets per channel. The sockets are labeled DIMM 1, DIMM 2, DIMM 3, and DIMM 4. Sockets DIMM 1 and DIMM 2 operate in memory channel A. Sockets DIMM 3 and DIMM 4 operate in memory channel B. Figure 7-8 Memory Sockets Item Description Socket Color 1 DIMM socket DIMM 1, Channel A Black (populate first) 2 DIMM socket DIMM 2, Channel A White 3 DIMM socket DIMM 3, Channel B Black (populate second) 4 DIMM socket DIMM 4, Channel B White The system will automatically operate in single channel mode, dual channel mode, or flex mode, depending on how the DIMMs are installed. ● The system will operate in single channel mode if the DIMM sockets are populated in one channel only. ● The system will operate in a higher-performing dual channel mode if the total memory capacity of the DIMMs in Channel A is equal to the total memory capacity of the DIMMs in Channel B. The technology and device width can vary between the channels. For example, if Channel A is populated with two 256MB DIMMs and Channel B is populated with one 512 MB DIMM, the system will operate in dual channel mode. ● The system will operate in flex mode if the total memory capacity of the DIMMs in Channel A is not equal to the total memory capacity of the DIMMs in Channel B. In flex mode, the channel populated with the least amount of memory describes the total amount of memory assigned to dual channel and the remainder is assigned to single channel. For optimal speed, the channels should be balanced so that the largest amount of memory is spread between the two channels. For example, if you are populating the sockets with one 1-GB DIMM, two 512-MB DIMMs, and one 256-MB DIMM, one channel should be populated with the 1-GB DIMM and one 256-MB DIMM and the other 70 Chapter 7 Removal and Replacement Procedures - Small Form Factor (SFF) Chassis ENWW

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Populating DIMM Sockets
There are four DIMM sockets on the system board, with two sockets per channel. The sockets are
labeled DIMM 1, DIMM 2, DIMM 3, and DIMM 4. Sockets DIMM 1 and DIMM 2 operate in memory
channel A. Sockets DIMM 3 and DIMM 4 operate in memory channel B.
Figure 7-8
Memory Sockets
Item
Description
Socket Color
1
DIMM socket DIMM 1, Channel A
(populate first)
Black
2
DIMM socket DIMM 2, Channel A
White
3
DIMM socket DIMM 3, Channel B
(populate second)
Black
4
DIMM socket DIMM 4, Channel B
White
The system will automatically operate in single channel mode, dual channel mode, or flex mode,
depending on how the DIMMs are installed.
●
The system will operate in single channel mode if the DIMM sockets are populated in one channel
only.
●
The system will operate in a higher-performing dual channel mode if the total memory capacity of
the DIMMs in Channel A is equal to the total memory capacity of the DIMMs in Channel B. The
technology and device width can vary between the channels. For example, if Channel A is
populated with two 256MB DIMMs and Channel B is populated with one 512 MB DIMM, the system
will operate in dual channel mode.
●
The system will operate in flex mode if the total memory capacity of the DIMMs in Channel A is not
equal to the total memory capacity of the DIMMs in Channel B. In flex mode, the channel populated
with the least amount of memory describes the total amount of memory assigned to dual channel
and the remainder is assigned to single channel. For optimal speed, the channels should be
balanced so that the largest amount of memory is spread between the two channels. For example,
if you are populating the sockets with one 1-GB DIMM, two 512-MB DIMMs, and one 256-MB
DIMM, one channel should be populated with the 1-GB DIMM and one 256-MB DIMM and the other
70
Chapter 7
Removal and Replacement Procedures — Small Form Factor (SFF) Chassis
ENWW