hp workstations zx6000, hp server rx2600 - operation and maintenance guide

System Board
Chip Spare Functionality (rx2600 systems only)
Appendix B
188
Chip Spare Functionality (rx2600 systems only)
Chip spare enables an entire DDR SDRAM chip on a DIMM to be bypassed/replaced in
the event that a multi-bit error is detected on the DDR SDRAM. In order to use the chip
spare functionality on your system, only DIMMs built with ×4 DDR SDRAM parts can be
used, and these DIMMs must be loaded in quads (two DIMMs per memory cell, loaded in
the same location in each memory cell and according to the following sequence).
Using the DIMM loading order shown above, chip spare can be achieved if four identical
DIMMs are loaded in the slots labeled “1st” and “2nd” found in each memory cell. If more
DIMMs are added to the example case, four identical DIMMs (identical to each other, but
can be different from the original quad that was loaded) must be loaded in the slots
labeled “3rd” and “4th” and finally four identical DIMMs (identical to each other, but can
be different from the original quad that was loaded) must be loaded in the slots labeled
“5th” and “6th.” For more information on quad loading, refer to the section “Removing
and Replacing Memory” in Chapter 2 of this document.
DIMM 0B
DIMM 1B
DIMM 4B
DIMM 5B
DIMM 2B
DIMM 3B
DIMM 0A
DIMM 1A
DIMM 4A DIMM 5A
DIMM 2A
DIMM 3A
2nd
1st
5th
6th
3rd 4th
1st
2nd
5th 6th
3rd 4th
Memory Cell 0
Memory Cell 1
Loading
Order
Loading
Order
This is the location of the PCI/AGP card cage (reference point).