ASRock Fatal1ty 990FX Professional [19/75] Installation of memory modules dimm

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 of the same color. In other words, you have to install

identical DDR3 DIMM pair in Dual Channel A (DDR3_A1 and DDR3_B1; Red

slots; see p.14 No.8) or identical DDR3 DIMM pair in Dual Channel B (DDR3_

A2 and DDR3_B2; Black slots; see p.14 No.9), 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 Conﬁ gurations

DDR3_A1 DDR3_A2 DDR3_B1 DDR3_B2

(Red Slot) (Black Slot) (Red 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 black slot (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 in the slots of the

same color. In other words, install them either in the set of red slots

(DDR3_A1 and DDR3_B1), or in the set of black 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.