ASROCK FM2A85X Extreme4-M User Manual download pdf (Page 21)

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 pairs. In other

words, you have to install identical DDR3 DIMM pairs in Dual Chan-

nel A (DDR3_A1 and DDR3_B1, see p.16 No. 7) or identical DDR3

DIMM pairs in Dual Channel B (DDR3_A2 and DDR3_B2, see p.16

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, 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

(Black Slot)

DDR3_A2

(Black Slot)

DDR3_B1

(Black Slot)

DDR3_B2

(Black Slot)

(1) Populated - Populated -

(2) - Populated - Populated

(3) Populated Populated Populated Populated

* For conguration (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

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ASROCK FM2A85X Extreme4-M User Manual Page 21