The memory slot is dusty or oxidized. This motherboard provides two pin DDR2 (Double Data Rate 2) DIMM slots and two pin DDR3 (Double Data Rate 3) DIMM slots, and supports Dual. Channel. It is not allowed to install a DDR3 memory module into DDR2 slot or install a DDR2 memory module into DDR3 slot; otherwise, this motherboard and DIMM may be. asrock n68c-s ucc manual. Instruction:The memory module is divided into SD, DDR, DDR2, DDR3 models. The memory is not compatible. Use a brush and wash water to clean it (if you don't have wash water, just brush it down)c. Você pode usar o saldo total do crédito. This motherboard provides two pin DDR2 (Double Data Rate 2) DIMM slots and two pin DDR3 (Double Data Rate 3) DIMM slots, and supports Dual Channel. . The memory slot is dusty or oxidized.