ASRock X79 Extreme6 Quick Installation Guide - Page 19

2.3 Installation of Memory Modules (DIMM) This motherboard provides eight 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, so that Quad Channel Memory Technology can be activated. 1. Due to Intel® CPU spec definition, please install the memory modules on DDR3_A1, DDR3_B1, DDR3_C1 and DDR3_D1 for the first priority. If above four DDR3 DIMM slots are fully installed, and you want to use more than four memory modules, please install the other memory modules from left to right (from DDR3_A2, DDR3_ B2, DDR3_D2 to DDR3_C2.) 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 more than 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. 19 ASRock X79 Extreme6/GB / X79 Extreme6 Motherboard English