Dell PowerEdge C6145 - Manual (Page 163)

Installing System Components | 163
System Memory
Each system board has thirty-two unbuffered or registered DDR3-DIMM
slots for the installation of up to thirty-two DDR3-800/1066/1333 memory
chips to support the four processors. See "System Board Connectors" on
page 229 for the location of the memory modules.
Supported DIMM Configuration
For the sequence of the thirty-two DIMM sockets, see Figure 3-31. When
you insert the SR/DR DIMM(s), always start with CHA_DIMM1. See Table
3-7 for possible memory configuration.
Figure 3-31. Memory Slot Locations