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Hi xTomy,1 person found this helpful
you may want to have a look at
FB-DIMM Voltage Compatibility
Servers were originally shipped with 1.8 V FB-DIMMs in early 2008 until 1.5 V FB-DIMMs were qualified in late 2008. If you want to add additional memory to a server purchased before the release of 1.5 V FB-DIMMs, you must replace all 1.8 FB-DIMMs with 1.5 V FB-DIMMs and upgrade to Firmware 7.1.6 or later.
Mixing of 1.8 V and 1.5 V FB-DIMMs is not supported.
Hope this helps.
many thanks you for your reply. It is what I need to know.
If we will expecting that we have 1.8V RAM type at server, it is possible to upgrade server RAMs with new higher RAM capacity modules with 1.8V? Voltage will be same at all branches...
Also what is mean "All FB-DIMMs within a *single CMP* branch must have the same capacity?" Capacity must be same at all 8 slots (two branches) or only at 4 slots (one branche)
Edited by: xTomy on 21.12.2012 2:26
as for the RAM capasity,is point 4 of the rules below an answer? If not could you elaborate?
1. Eight, twelve, and sixteen FBDIMM configurations are supported on the system board.
2. Eight and sixteen FBDIMM configurations are supported on the memory mezzanine.
3. The system board requires sixteen FBDIMMs before installing the memory mezzanine.
4. All FBDIMMs within a CMP must have the same memory size.
5. If Firmware is < 7.1.7.f, all FBDIMMs must have the same memory size.
6. Specific Firmware levels support different memory sizes on different CMPs
(i.e. FBDIMMs in CMP0 can have different memory size than those in CMP1.)
Supported with Firmware 7.1.7.f.
Supported with Firmware 7.2.2.e, 7.2.4.e and 7.2.4.f, but
BugID 6879970 affects mixed memory configurations with these levels.
7. Mixing 1.8V and 1.5V FBDIMMs is not supported.
8. Low Voltage 1.5V FBDIMMs require System Firmware 7.1.6.d.