ASROCK 990FX Extreme9 Handbuch Seite 16

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2.3 Installation of Memory Modules (DIMM)
This motherboard provides four 240-pin DDR3 (Double Data Rate 3) DIMM slots,
and supports Dual Channel Memory Technology. For dual channel confi guration,
you always need to install identical (the same brand, speed, size and chip-type)
DDR3 DIMM pair in the slots. In other words, you have to install identical DDR3
DIMM pair in Dual Channel (DDR3_A1 and DDR3_B1; see p.2 No.7) or identical
DDR3 DIMM pair in Dual Channel (DDR3_A2 and DDR3_B2; see p.2 No.8), so that
Dual Channel Memory Technology can be activated. This motherboard also allows
you to install four DDR3 DIMMs for dual channel confi guration, and please install
identical DDR3 DIMMs in all four slots. You may refer to the Dual Channel Memory
Confi guration Table below.
Dual Channel Memory Confi gurations
DDR3_A1
(Black Slot)
(1) -
(2) Populated
(3)* Populated
* For the confi guration (3), please install identical DDR3 DIMMs in all four
slots.
1. Please install the memory module into DDR3_A2 and DDR3_B2
slots for the fi rst priority.
2. If you want to install two memory modules, for optimal compatibility
and reliability, it is recommended to install them either in the set
of DDR3_A1 and DDR3_B1 slots, or in the set of DDR3_A2 and
DDR3_B2 slots.
3. 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.
4. 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 activate the Dual Channel
Memory Technology .
5. It is not allowed to install a DDR or DDR2 memory module into
DDR3 slot; otherwise, this motherboard and DIMM may be dam-
aged.
6. If you adopt DDR3 2450/2100 memory modules on this mother-
board, it is recommended to install them on DDR3_A2 and DDR3_
B2 slots.
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ASRock 990FX Extreme9 Motherboard
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DDR3_A2 DDR3_B1 DDR3_B2
(Black Slot) (Black Slot) (Black Slot)
Populated - Populated
- Populated -
Populated Populated Populated