asus p4p800 se (RAM 一問)

asus p4p800 se
[url=http://%77%77%77%2E%7A%69%64%64%75%2E%63%6F%6D/%64%6F%77%6E%6C%6F%61%64/%37%33%32%38%39%32%32/%32%30%30%39%2D%31%31%2D%31%32%2E%72%61%72%2E%68%74%6D%6C]http://tw.asus.com/products.aspx ... 179&modelmenu=1[/url]
寫明係用 ddr1 400
但如果朋友賣兩條 ddr2 800
請問我部電腦可以用嗎??thx[url=images/smilies/emot/icon27.gif][img]images/smilies/emot/icon27.gif[/img][/url]