ASROCK 990FX EXTREME3 Quick Start Manual download pdf (Page 14)

ASRock 990FX Extreme3 Motherboard

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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 con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 A (DDR3_A1 and DDR3_B1; Black slots; see p.2 No.7)

or identical DDR3 DIMM pair in Dual Channel B (DDR3_A2 and DDR3_B2; Black

slots; 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

conguration, and please install identical DDR3 DIMMs in all four slots. You may

refer to the Dual Channel Memory Conguration Table below.

Dual Channel Memory Congurations

DDR3_A1 DDR3_A2 DDR3_B1 DDR3_B2

(Black Slot) (Black Slot) (Black Slot) (Black Slot)

(1) Populated - Populated -

(2) - Populated - Populated

(3)* Populated Populated Populated Populated

For the conguration (3), please install identical DDR3 DIMMs in all four

slots.

1. Please install the memory module into the slots DDR3_A2 and

DDR3_B2 for the 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

slots DDR3_A1 and DDR3_B1, or in the set of slots DDR3_A2 and

DDR3_B2.

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 2100 memory modules on this motherboard, it is

recommended to install them on DDR3_A2 and DDR3_B2 slots.

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ASROCK 990FX EXTREME3 Quick Start Manual Page 14