電腦配備換這樣會比之前好嗎??

我原本是
amd-3000+
nforce 4 ultra
6600
2gb ddr400

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跑wow fps 約15上下

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最近幫老爸直接在奇摩買一台pc

core due 1.6g
晶片 946gz
ddr2 667 512mb
[url=http://%33%34%31%61%36%33%38%65%2E%7A%78%78%6F%2E%6E%65%74]http://taiwan.msi.com.tw/index.php?...81&maincat_no=1[/url]


我跟我爸商量好了
要偷天換日一下

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我要他的主機板 cpu
然後在去買2gb ddr2 667
就等於我爸用我的amd3000+ 跟 再隨便買一張顯示卡放在我的amd3000+

因為我手頭很緊就只能這樣

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問題一
這樣我跑3d遊戲 例如:wow 效能會不會比以前好很多

問題二
還是我在存多一點我爸用我的6600 我在買張8600 gt

問題三
我該直接買ddr2 800嗎? 以後升級才方便?

問題四
我經費有限若買8400或者8500跑3d遊戲 例如:wow會比現在6600好很多嗎
若已經可以好很多我就不考慮8600 我夠用就好了