Dell PowerEdge VRTX Owner's Manual page 31

Memory bus operating frequency can be 1600 MT/s, 1333 MT/s, 1066 MT/s, or 800 MT/s depending on:
• DIMM type (UDIMM, RDIMM, or LRDIMM)
• DIMM configuration (number of ranks)
• maximum frequency of the DIMMs
• number of DIMMs populated per channel
• DIMM operating voltage
• system profile selected (for example, Performance Optimized, Custom, or Dense Configuration Optimized)
• maximum supported DIMM frequency of the processors
The system contains 24 memory sockets split into two sets of 12 sockets, one set per processor. Each 12-socket set is
organized into four channels. In each channel, the release levers of the first socket are marked white, the second socket
black, and the third socket green.
NOTE: DIMMs in sockets A1 to A12 are assigned to processor 1 and DIMMs in sockets B1 to B12 are assigned to
processor 2.
The following table shows the memory populations and operating frequencies for the supported configurations.
DIMM Type DIMMs Populated/
Channel
UDIMM ECC 1
2
RDIMM 1
2
3
LRDIMM 1
2
3
Operating Frequency (in MT/s)
1.5 V
1333, 1066, and 800
1333, 1066, and 800
1600, 1333, 1066, and 800
1333, 1066, and 800
1600, 1333, 1066, and 800
1066 and 800
1333, 1066, and 800
1333 and 1066
1333 and 1066
1066
1.35 V
1333, 1066, and 800
1333, 1066, and 800
1333, 1066, and 800
1066 and 800
1333, 1066, and 800
1066 and 800
1066 and 800
1333 and 1066
1333 and 1066
1066
Maximum DIMM Rank/
Channel
Dual rank
Dual rank
Dual rank
Quad rank
Dual rank
Quad rank
Dual rank
Quad rank
Quad rank
Quad rank
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