Dell External OEMR R320 Owner's Manual page 44

Figure 15. Memory Socket Locations
Memory channels are organized as follows:
channel 0: memory sockets A1 and A4
channel 1: memory sockets A2 and A5
channel 2: memory sockets A3 and A6
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
44
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
1.35 V
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