System Memory; Memory Slot Features; Supported Memory Module Configuration - Dell PowerEdge C6220 Hardware Owner's Manual

System Memory

Each system board has sixteen DDR3 memory module slots for the
installation of up to sixteen unbuffered or registered DDR3-1333MHz
(1600MHz @2 memory modules per channel) memory modules to support
processor 1 and processor 2. See "System Board Connectors" on page 294
for the location of the memory modules.

Memory Slot Features

Support 8 channels, 16 UDIMMs/RDIMMs of DDR3
Speed up to 1600MT/s
Max. capacity: 512GB with 32GB RDIMM, LRDIMM
Support DDR3/DDR3L
Support ECC

Supported Memory Module Configuration

For the sequence of the sixteen memory-module slots, see Figure 3-53. The
system requires at least one memory module installed on processor 1's
DIMM slot 1 in order to be booted up. When you insert the memory
module(s), always start with CHA_A1. The optimized memory module
installation sequence is 1/2/3/4/5/6/7/8.
See Table 3-2 and Table 3-3 for possible memory configurations.
208 | Installing System Components