ASRock X48TurboTwins-WiFi User Manual - Page 18
Installation of Memor, Installation of Memory Modules DIMM, y Modules DIMM
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2.5 Installation of Memory Modules (DIMM) This motherboard provides two 240-pin DDR2 (Double Data Rate 2) DIMM slots and 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) DDR2/DDR3 DIMM pair in the slots of the same color. In other words, you have to install identical DDR2 DIMM pair in Dual Channel A (DDRII_1 and DDRII_2; Yellow slots; see p.11 No.7), identical DDR3 DIMM pair in Dual Channel B (DDR3_A1 and DDR3_B1; Green slots; see p.11 No.8), or identical DDR3 DIMM pair in Dual Channel C (DDR3_A2 and DDR3_B2; Pink slots; see p.11 No.9), so that Dual Channel Memory Technology can be activated. This motherboard also allows you to install four DDR3 DIMMs for dual channel configuration, and please install identical DDR3 DIMMs in all four slots. You may refer to the Dual Channel Memory Configuration Table below. Dual Channel DDR2 Memory Configurations (DS: Double Side, SS: Single Side) DDRII_1 (Yellow Slot) 2 memory modules SS 2 memory modules DS DDRII_2 (Yellow Slot) SS DS Dual Channel DDR3 Memory Configurations (DS: Double Side, SS: Single Side) DDR3_A1 (Green Slot) 2 memory modules SS 2 memory modules DS 2 memory modules X 2 memory modules X 4 memory modules SS 4 memory modules DS DDR3_A2 (Pink Slot) X X SS DS SS DS DDR3_B1 (Green Slot) SS DS X X SS DS DDR3_B2 (Pink Slot) X X SS DS SS DS 18