ASRock AD2550B-ITX User Manual - Page 13

2.3 Installation of Memory Modules (SO-DIMM) AD2550B-ITX motherboard provides two 240-pin DDR3 (Double Data Rate 3) SODIMM slots. 1. It is not allowed to install a DDR or DDR2 memory module into DDR3 slot; otherwise, this motherboard and SO-DIMM may be damaged. 2. Please install the memory module from DDR3_A2 slot for the first priority. Installing a SO-DIMM Please make sure to disconnect power supply before adding or removing SO-DIMMs or the system components. Step 1. Unlock a SO-DIMM slot by pressing the retaining clips outward. Step 2. Align a SO-DIMM on the slot such that the notch on the SO-DIMM matches the break on the slot. notch break notch break The SO-DIMM only fits in one correct orientation. It will cause permanent damage to the motherboard and the SO-DIMM if you force the SODIMM into the slot at incorrect orientation. Step 3. Firmly insert the SO-DIMM into the slot until the retaining clips at both ends fully snap back in place and the SO-DIMM is properly seated. 13