ASRock 990FX Extreme6 User Manual - Page 19

2.3 Installing Memory Modules (DIMM) his motherboard provides four 240-pin DDR3 (Double Data Rate 3) DIMM slots, and supports Dual Channel Memory Technology. 1. For dual channel coniguration, you always need to install identical (the same brand, speed, size and chip-type) DDR3 DIMM pairs. 2. It is unable to activate Dual Channel Memory Technology with only one or three memory module installed. 3. It is not allowed to install a DDR or DDR2 memory module into a DDR3 slot; otherwise, this motherboard and DIMM may be damaged. 4. Please install the memory module into DDR3_A2 and DDR3_B2 slots for the irst priority. 5. If you adopt DDR3 2450/2100 memory modules on this motherboard, it is recommended to install them on DDR3_A2 and DDR3_B2 slots. Dual Channel Memory Coniguration Priority 1 2 3 DDR3_A1 Populated Populated DDR3_A2 Populated Populated DDR3_B1 Populated Populated DDR3_B2 Populated Populated he DIMM only its in one correct orientation. It will cause permanent damage to the motherboard and the DIMM if you force the DIMM into the slot at incorrect orientation. English 14