Dell PowerEdge T420 Owner's Manual page 72

• 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 processor
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
The system contains 12 memory sockets split into two sets of six sockets, one set per processor. Each six-socket set is
organized into three channels. In each channel, the release levers of the first socket is marked white and the second
black.
NOTE: DIMMs in sockets A1 to A6 are assigned to processor 1 and DIMMs in sockets B1 to B6 are assigned to
processor 2.
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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
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
Maximum DIMM Rank/
Channel
Dual rank
Dual rank
Dual rank
Quad rank
Dual rank
Quad rank