Owners Manual
Mode-specic guidelines
Four memory channels are allocated to each processor. The allowable congurations depend on the memory mode selected.
NOTE: You can mix x4 and x8 DRAM based DIMMs to support RAS features. However, all guidelines for specic RAS features
must be followed. x4 DRAM based DIMMs retain Single Device Data Correction (SDDC) in memory optimized (independent
channel) mode. x8 DRAM based DIMMs require Advanced ECC mode to gain SDDC.
The following section provide additional slot population guidelines for each mode:
Memory optimized (independent channel) mode
This mode supports Single Device Data Correction (SDDC) only for memory modules that use x4 device width. It does not impose any
specic slot population requirements.
Removing a memory module
Prerequisites
1 Follow the safety guidelines listed in the Safety instructions section.
2 Follow the procedure listed in the Before working inside your system section.
3 Remove the cooling shroud.
WARNING
: The memory modules are hot to touch for some time after the system has been powered down. Allow the memory
modules to cool before handling them. Handle the memory modules by the card edges and avoid touching the components or
metallic contacts on the memory module.
CAUTION: To ensure proper system cooling, memory module blanks must be installed in any memory socket that is not occupied.
Remove memory module blanks only if you intend to install memory modules in those sockets.
Steps
1 Locate the appropriate memory module socket.
2 To release the memory module from the socket, simultaneously press the ejectors on both ends of the memory module socket.
CAUTION
: Handle each memory module only by the card edges, ensuring not to touch the middle of the memory
module or metallic contacts.
3 Lift the memory module away from the chassis.
32
Installing and removing system components