要幾多RAM至合標準?

每人標準也有不同，視符用途 及 看手頭預算有多少；一般來說 1G 記億體是標準入門配備，如玩 Online game 要同時多開，最好適量地記億體容量，用一張級數較強的顯卡 (如: 7600gt, x1650GT DDR3)
512M 升級 1G 效能增長是最大；1G 升級 2G 效能增長已放慢；個人非常建議您直接購買單條 1GB 記億體，目前 1G DDR2 667 三百數已買到；多 RAM 點都好過不夠 RAM 洗，您塊板是 suppot 4GB MAX 記億體。

512mb 667x2 如果打online有點lag, 加到1gb 667x2已經ok (kingston) (打天2都夠用)
如果想開雙視窗, 最好2gb, 就可保持畫面靚(不用最小化)及沒什麼lag

To certain extent, it depends upon what OS you're using.

For WindowXP, 2G is more than enough while you will have around 10~15% average improvement on performance; but you have to pay 100% extra-money.

For the time being, not so much games can support Window Vista, therefore, if you don't want to upgrade the OS in upcoming few months, or your favourite game(s) do not support Vista, I recommend to buy 1G high quality ram (don't use cheap RAM !!) to ensure a stable performance when running games. That's more important indeed.