The system reports a mismatched DIMM-pair and disables the DIMM-pair at POST when Quad-Rank Memory Fully Buffered DIMM is paired with non-Quad-Rank DIMM. Also, the system may not recognize the installed Quad-Rank DIMM if the BIOS is down level. The new Quad-Rank Fully Buffered DIMM Option and FRU part numbers are listed below: OPTION FRU DESCRIPTION 46C7418 46C7421 1 GB 1Rx8 DDR2-667 PC2-5300 555 FBDIMM with AMB+ version of Advanced Memory Buffer device. 46C7419 46C7422 2 GB 2Rx8 DDR2-667 PC2-5300 555 FBDIMM with AMB+ version of Advanced Memory Buffer device. 46C7420 46C7423 4 GB 4Rx8 DDR2-667 PC2-5300 555 FBDIMM with AMB+ version of Advanced Memory Buffer device. Note: Option number is for two-DIMM kit.
Source
RETAIN tip: H193428
Symptom
The system reports a mismatched DIMM-pair and disables the DIMM-pair at POST when Quad-Rank Memory Fully Buffered DIMM is paired with non-Quad-Rank DIMM. Also, the system may not recognize the installed Quad-Rank DIMM if the BIOS is down level.
The new Quad-Rank Fully Buffered DIMM option and replacement part numbers are listed below:
| |
| OPTION |
Replacement
part number |
DESCRIPTION |
| Note: Option number is for two-DIMM kit. |
| 46C7418 |
46C7421 |
1 GB 1Rx8 DDR2-667 PC2-5300 555 FBDIMM with AMB+ version of Advanced Memory Buffer device. |
| 46C7419 |
46C7422 |
2 GB 2Rx8 DDR2-667 PC2-5300 555 FBDIMM with AMB+ version of Advanced Memory Buffer device. |
| 46C7420 |
46C7423 |
4 GB 4Rx8 DDR2-667 PC2-5300 555 FBDIMM with AMB+ version of Advanced Memory Buffer device. |
|
Affected configurations
The system may be any of the following IBM servers:
- BladeCenter HS21 XM, type 1915, any model
- BladeCenter HS21 XM, type 7995, any model
- BladeCenter HS21, type 1885, any model
- BladeCenter HS21, type 8853, any model
- System x3400, type 7973, any model
- System x3400, type 7974, any model
- System x3400, type 7975, any model
- System x3400, type 7976, any model
- System x3500, type 7977, any model
- System x3550, type 1013, any model
- System x3550, type 1913, any model
- System x3550, type 7978, any model
- System x3650, type 1914, any model
The following system BIOS level(s) are affected:
This tip is not option specific.
This tip is not software specific.
Solution
Ensure that the affected DIMM pair(s) are using the same technology with matched option and/or replacement part numbers. The following BIOS versions are the minimum levels required to support Quad-Rank memory options:
| |
| MACHINE TYPE |
BUILD LEVEL |
RELEASE |
| 8853, 1885 |
BCE136AUS |
v1.13 |
| 7995, 1915 |
MJE128AUS |
v1.10 |
| 7979, 1914 |
GGE139GUS |
v1.11 |
| 7978, 1913 |
GFE138AUS |
v1.11 |
| 7973, 7974 |
SPE165A |
v1.65 |
| 7975, 7976 |
SPE165A |
v1.65 |
| 7977 |
SPE165A |
v1.65 |
|
Additional information
Memory DIMMs within the same bank must be the same type, same speed, and same technology (same memory DIMM option number).
Memory DIMMs within different banks can be a different type and different technology, but must be the same speed.
Each memory DIMM speed is based on the rating shown on the IBM barcode label, not the supplier's label.
BladeCenter:Operating system independent / None
System x:Operating system independent / None
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