ASRock X79 Extreme7 Quick Installation Guide - Page 16

2.3 Installation of Memory Modules (DIMM) This motherboard provides six 240-pin DDR3 (Double Data Rate 3) DIMM slots, and supports Quad Channel Memory Technology. For quad channel configuration, you always need to install identical (the same brand, speed, size and chip-type) DDR3 DIMM in the slots: You have to install identical DDR3 DIMM in DDR3_A1 (Black slot; see p.2 No.1), DDR3_B1 (Black slot; see p.2 No.3), DDR3_D1 (Black slot; see p.2 No.7) and DDR3_C1 (Black slot; see p.2 No.9), so that Quad Channel Memory Technology can be activated. 1. Due to Intel® CPU spec definition, the system will not boot if only two DIMM are installed into DDR3_B2 and DDR3_D2 slots. Please install the memory modules into DDR3_B1 and DDR3_D1 slots first, then DDR3_B2 and DDR3_D2 slots can work properly. 2. If only two memory modules are installed in the DDR3 DIMM slots, then Dual Channel Memory Technology is activated. If three memory modules are installed, then Triple Channel Memory Technology is activated. If four memory modules are installed in the DDR3 DIMM slots, then Quad Channel Memory Technology is activated. 3. It is not allowed to install a DDR or DDR2 memory module into DDR3 slot; otherwise, this motherboard and DIMM may be damaged. 16 ASRock X79 Extreme7 Motherboard English