Gigabyte SB93 Quick Start Manual page 12

5. Memory / 記憶體
There are fixing grooves on both sides / 兩側有固定凹槽
DDR
Make sure the direction of the foolproof groove must be the same as that of the
memory slot on the motherboard.
安裝主機板上的記憶體插槽時，其方向必須與防呆凹槽的方向相同才能順利安裝。
Fixing the hooks. The hooks must be fixed into the grooves before the installation is
considered complete.
固定卡勾。請務必將其卡於固定凹槽，才是正確安裝方式。