Dell PowerEdge VRTX - 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
Operating Frequency (in MT/s) Maximum DIMM Rank/
Channel
1.5 V 1.35 V
UDIMM ECC 1 1333, 1066, and 800 1333, 1066, and 800 Dual rank
2 1333, 1066, and 800 1333, 1066, and 800 Dual rank
RDIMM 1 1600, 1333, 1066, and 800
1333, 1066, and 800 1333, 1066, and 800
1066 and 800 Dual rank
Quad rank
2 1600, 1333, 1066, and 800
1066 and 800 1333, 1066, and 800
1066 and 800 Dual rank
Quad rank
3 1333, 1066, and 800 1066 and 800 Dual rank
LRDIMM 1 1333 and 1066 1333 and 1066 Quad rank
2 1333 and 1066 1333 and 1066 Quad rank
3 1066 1066 Quad rank
31