疑問 - CPU跟主機板??

[頭目]

請問一下!!我可以只換CPU不換主機板嗎??這樣電腦效能會改善嗎??還是沒差??
Time of this report: 4/2/2008, 10:57:43
Machine name: 888TIGER-F54242
Operating System: Windows XP Professional (5.1, Build 2600) Service Pack 2 (2600.xpsp_sp2_gdr.070227-2254)
Language: Chinese (Regional Setting: Chinese)
System Manufacturer: To Be Filled By O.E.M.
System Model: To Be Filled By O.E.M.
BIOS: BIOS Date: 09/24/04 16:10:38 Ver: 08.00.09
Processor: AMD Sempron(tm) , MMX, 3DNow, ~1.0GHz
Memory: 1278MB RAM
Page File: 276MB used, 2008MB available
Windows Dir: C:\WINDOWS
DirectX Version: DirectX 9.0c (4.09.0000.0904)
DX Setup Parameters: Not found
DxDiag Version: 5.03.2600.2180 32bit Unicode
這是目前的設備....我的CPU應該是1G的吧!!那我想要升級到2G的這樣我的電腦效能會比較好嗎??還是CPU必須跟主機板一起換會比較好??

那如果可以只換CPU~~大大有推薦的CPU嗎??因為本身有在玩遊戲!!所以大概要2G的CPU