Owners Manual

Memory channels are organized as follows:
Processor 1
channel 0: memory sockets A1 and A5
channel 1: memory sockets A2 and A6
channel 2: memory sockets A3 and A7
channel 3: memory sockets A4 and A8
Processor 2
channel 0: memory sockets B1
channel 1: memory sockets B2
channel 2: memory sockets B3
channel 3: memory sockets B4
The following table shows the memory populations and operating frequencies for the supported congurations.
Table 11. Supported congurations
DIMM Type DIMMs Populated/
Channel
Operating Frequency (in
MT/s)
Maximum DIMM Rank/Channel Voltage
RDIMM 1 2400 Dual rank or single rank 1.2 V
2
General memory module installation guidelines
Your system supports Flexible Memory Conguration, enabling the system to be congured and run in any valid chipset architectural
conguration. The following are the recommended guidelines for installing memory modules:
• x4 and x8 DRAM-based DIMMs can be mixed. For more information, see the Mode-specic guidelines section.
• Up to two dual- or single-rank RDIMMs can be populated per channel.
• If memory modules with dierent speeds are installed, they will operate at the speed of the slowest installed memory modules or slower
depending on system DIMM conguration.
• Populate DIMM sockets only if a processor is installed. For single-processor systems, sockets A1 to A8 are available. For dual-processor
systems, sockets A1 to A8 and sockets B1 to B4 are available.
• Populate all sockets with white release levers rst, and then all the sockets with black release levers.
• When mixing memory modules with dierent capacities, populate the sockets with memory modules with highest capacity rst. For
example, if you want to mix 4 GB and 8 GB DIMMs, populate 8 GB DIMMs in the sockets with white release levers and 4 GB DIMMs in
the sockets with black release levers.
• In a dual-processor conguration, the memory conguration for each processor should be identical through the rst eight slots. For
example, if you populate socket A1 for processor 1, then populate socket B1 for processor 2, and so on.
• Memory modules of dierent capacities can be mixed provided other memory population rules are followed (for example, 4 GB and 8
GB memory modules can be mixed).
• Mixing of more than two DIMM capacities in a system is not supported.
• Populate two DIMMs per processor (one DIMM per channel) at a time to maximize performance.
Installing and removing system components
31