Fujitsu PRIMERGY BX620 S6 Options Manual page 34

Memory operating modes
Independent Channel Mode (maximum memory configuration)
The populated memory can be used in full (maximum 192 GB).
Mirrored Channel Mode (maximum security)
Only the populated memory in the channels A and D (see
page 33) can be used (maximum 64 GB). The channels B and E are for
failure protection purposes only. They contain the mirrored data from
channels A and D. Channels C and F are not used.
Performance Channel Mode (high memory configuration with high security)
The populated memory of the 6 channels (A - F) can be used completely
(max. 192 GB).
Spare channel mode (large population and large security)
Only the populated memory of the four channels A, B, D and E can be used
(max. 128 GB). The channels C and F serve as safeguarding against failure.
Spare channel mode is only supported by Intel XEON E/L/X56nn
processors.
34 Options Guide
figure 13 on
BX620 S6