Fujitsu MX130 S2 manual Operation modes, Number of memory modules inserted, Slots to be used

				Main memory
	Number of memory modules inserted
Slots to be used	1	2	3		4
Slot 1, Channel A	o	o	o		o
Slot 2, Channel B		o	o		o
Slot 3, Channel A			o		o
Slot 4, Channel B					o

Table 5: Mounting order

10.1.2 Operation modes

–The maximum performance can be achieved in a symmetric dual-channel configuration. Therefore both channels have to be populated with the same amount of memory. The DRAM device technology (1 Gbit / 2 Gbit / 4 Gbit) may vary from one channel to the other.

–If the amount of memory differs between the two channels, the system board will run in dual-channel asymmetric mode.

–Regardless of the mode, all DIMMs will run at the highest common frequency that is allowed by the SPD Data of the DIMMs and the maximum speed of the selected configuration.

–Single-channel mode is used if one memory module is populated in slot 1.

MX130 S2 Upgrade and Maintenance Manual 181