看來單面雙面... 不一定是外表看到的, 可是.... 很多賣 RAM 都沒寫, !@#!@# " The physical expansion card may have chips on both of its sides, or only on one side, but is considered to be single sided because the computer can "see" all of its memory at once. "
雙面的 performance 會比較差....?! "Higher-end computer systems may wish to avoid using double-sided memory because of the reduced performance that results from the time needed to switch banks"