ASRock X38TurboTwins-WiFi Quick Installation Guide - Page 14

2.3 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.2 No.7), identical DDR3 DIMM pair in Dual Channel B (DDR3_A1 and DDR3_B1; Green slots; see p.2 No.8), or identical DDR3 DIMM pair in Dual Channel C (DDR3_A2 and DDR3_B2; Pink slots; see p.2 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 English 1. 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 in the set of yellow slots (DDRII_1 and DDRII_2), in the set of green slots (DDR3_A1 and DDR3_B1), or in the set of pink slots (DDR3_A2 and DDR3_B2). 2. If only one memory module or three memory modules are installed in DDR3 DIMM slots on this motherboard, it is unable to activate the Dual Channel Memory Technology. If only one memory module is installed in DDR2 DIMM slots on this motherboard, it is unable to activate the Dual Channel Memory Technology. 14 ASRock X38TurboTwins-WiFi / X38TurboTwins Motherboard