Dell PowerEdge M520 Technical Guide - Page 18

Table 7 lists the DIMMs that are supported on the M520. For the latest information on supported memory, visit Dell.com/PowerEdge. Table 7. DIMMs supported Only Capacity (GB) Speed (MT/s) Type Ranks per DIMM Data width SDDC support Voltage 2 1600 RDIMM 1 x8 Advanced ECC 1.35 2 1333 RDIMM 1 x8 Advanced ECC 1.35 2 1600 UDIMM 1 x8 Advanced ECC 1.35 4 1333 RDIMM 2 x8 Advanced ECC 1.35 4 1600 RDIMM 2 x8 Advanced ECC 1.35 4 1333 RDIMM 1 x4 All modes 1.35 4 1333 RDIMM 2 x8 Advanced ECC 1.35 4 1600 UDIMM 2 x8 Advanced ECC 1.35 8 1333 RDIMM 2 x4 All modes 1.35 8 1600 RDIMM 2 x4 All modes 1.35 16 1600 RDIMM 2 x4 All modes 1.35 16 1333 RDIMM 2 x4 All modes 1.35 32 1333 RDIMM 4 x4 All modes 1.35 Memory configurations The M520 server supports flexible memory configurations ranging from capacities of 2GB to 384GB, and up to 6 DIMMs per processor (up to 12 DIMMs in a dual-processor configuration). Each processor has 3 memory channels, with each channel supporting up to 2 DIMMs. Flexible memory configuration The M520 supports a flexible memory configuration, according to the following basic rules:  Speed: If DIMMs of different speeds are mixed, all channels across all processors operate at the slowest DIMM's common frequency.  DIMM type: Only one type of DIMM is allowed per system: UDIMM or RDIMM. These types cannot be mixed. The following additional memory-population guidelines also apply to the M520:  Up to two quad-rank (QR) DIMMs and up to three dual-rank (DR) or single-rank (SR) DIMMs may be populated per channel.  DIMMs must be installed in each channel, starting with the DIMM farthest from the processor.  DIMMs should be installed with largest rank count to smallest. For example, if DR DIMMS are mixed with SR DIMMs, DR DIMMS should be placed in the lowest DIMM slots, followed by the SR DIMMs. For more information on memory configuration and population, see the Dell PowerEdge M520 Systems Owner's Manual on Dell.com/Support/Manuals. 18 PowerEdge M520 Technical Guide