Intel S5500WB User Manual

Intel® Server Board S5500WB TPS Functional Architecture
Revision 1.3
Intel order number E53971-004
25
3.4.7.2 Removing DIMMs
To remove a DIMM, follow these steps:
1. Turn off all peripheral devices connected to the server.
2. Turn off the server.
3. Remove the AC power cord from the server.
4. Remove the server’s cover.
5. Gently spread the retaining clips at each end of the socket. The DIMM lifts from the
socket.
6. Holding the DIMM by the edges, lift it from the socket and store it in an anti-static
package.
7. Reinstall and reconnect any parts you removed or disconnected to reach the DIMM
sockets.
8. Replace the server’s cover and reconnect the AC power cord.
3.4.8 Channel-Independent Mode
In the Independent Channel mode, you can populate multiple channels in any order (for
example, you can populate channels B and C while channel A is empty). Also, DIMMs on
adjacent channels do not need to have identical parameters. Therefore, all DIMMs are enabled
and used in the Independent Channel mode.
Adjacent slots on channels A and D do not need matching size and organization. However, the
speed of the channel is configured to the maximum common speed of the DIMMs.
The single channel mode is established using the independent channel mode by populating
DIMM slots from channel A only.
3.4.9 Memory RAS
The memory RAS offered by the Intel
®
5500 series processor is performed at channel level (for
example, during mirroring, channel B mirrors channel A). All DIMM matching requirements are
on a slot-to-slot basis on adjacent channels. For example, to enable mirroring, corresponding
slots on channels A and B must have DIMMS of identical parameters.
If one socket fails, the population requirements for RAS, the BIOS sets all six channels to the
Independent Channel mode. One exception to this rule is when all DIMM slots from a socket are
empty (for example, when only DIMM slots A1, B1, and C1 are populated, mirroring is possible
on the platform).
3.4.9.1 Memory Population for Channel Mirroring Mode
The mirrored configuration is a redundant image of the memory, and can continue to operate
despite the presence of sporadic uncorrectable errors.
Channel mirroring is a RAS feature in which two identical images of memory data are
maintained, thus providing maximum redundancy. On the Intel
®
5500 series based Intel server
boards, mirroring is achieved across channels. Active channels hold the primary image and the

Intel S5500WB Specifications

General

Brand	Intel
Model	S5500WB
Category	Server Board
Language	English