Intel SE7520JR2 - Manual (Page 23)

Server Board Features
Two methods for memory mirroring are available:
ƒ Four identical DIMMs are used in DIMM sockets 1A, 1B, 2A, and 2B.
If the DIMM in socket 1A fails, the DIMM in socket 2B takes over.
If the DIMM in socket 1B fails, the DIMM in socket 2A takes over.
ƒ Valid only on the versions of the Server Board SE7520JR2 that use DDR2 memory
(SE7520JR2SCSID2 and SE7520JR2SATAD2): Four DIMMs are used with identical single-
ranked DIMMs in Banks 2 and 3. DIMMs in sockets 1A and 1B must be dual-ranked and
identical.
If the DIMM in socket 1A fails, the DIMM in socket 1B takes over.
If the DIMM in socket 2A fails, the DIMM in socket 3B takes over.
If the DIMM in socket 2B fails the DIMM in socket 3A takes over.
For memory on-line sparing, one DIMM per channel is used as the memory spare. The spare
DIMM is not available for use, but is kept in reserve. If a DIMM begins to fail, the content of the
failing DIMM is copied to the spare DIMM in that channel. When all of the data is copied to the
spare DIMM, the primary DIMM is removed from service and the spare DIMM takes its place.
When memory on-line sparing is used, the spare DIMMs must be equal to or larger than the largest
in-service DIMM in that channel.
✏
NOTE
Memory mirroring and memory sparing are mutually exclusive. Only one can be active at a time.
Refer to the Intel
® Server Board SE7520JR2 Technical Product Specification for additional
information regarding the memory sub-system.
Power Supply
A minimum of 500 Watts is required. Your supply must provide a minimum of 1.2 A of 5 V
standby current or the board will not boot.
Intel® Server Board SE7520JR2 User Guide 23