ASROCK FM2A85X Extreme4-M Handbuch Seite 18

2.3 Installation of Memory Modules (DIMM)
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This motherboard provides four 240-pin DDR3 (Double Data Rate 3)
DIMM slots, and supports Dual Channel Memory Technology. For dual
channel configuration, you always need to install identical (the same
brand, speed, size and chip-type) DDR3 DIMM pairs. In other words,
you have to install identical DDR3 DIMM pairs in Dual Channel A
(DDR3_A1 and DDR3_B1, see p.2 No. 7) or identical DDR3 DIMM
pairs in Dual Channel B (DDR3_A2 and DDR3_B2, see p.2 No. 8), so
that Dual Channel Memory Technology can be activated. This moth-
erboard also allows you to install four DDR3 DIMMs for dual channel
configuration, please install identical DDR3 DIMMs in all four slots.
You may refer to the Dual Channel Memory Configuration Table below.
Dual Channel Memory Configurations
DDR3_A1
(Black Slot)
(1) Populated
(2) -
(3) Populated
* For configuration (3), please install identical DDR3 DIMMs in all four
slots.
1. If you want to install two memory modules, for optimal com-
patibility and reliability, it is recommended to install them in
DDR3_A1 and DDR3_B1 or in DDR3_A2 and DDR3_B2.
2. If only one memory module or three memory modules are
installed in the DDR3 DIMM slots on this motherboard, it is
unable to activate the Dual Channel Memory Technology.
3. If a pair of memory modules is NOT installed in the same
Dual Channel, for example, installing a pair of memory
modules in DDR3_A1 and DDR3_A2, it is unable to acti-
vate Dual Channel Memory Technology.
4. It is not allowed to install a DDR or DDR2 memory module
into a DDR3 slot; otherwise, this motherboard and DIMM
ASRock FM2A85X Extreme4-M Motherboard
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DDR3_A2 DDR3_B1
(Black Slot) (Black Slot)
- Populated
Populated -
Populated Populated
DDR3_B2
(Black Slot)
-
Populated
Populated