我想升级硬件，麻烦给个意见

System Information
Operating System: Windows XP Professional (5.1, Build 2600) Service Pack 2 (2600.xpsp_sp2_qfe.070227-2300)
Language: Chinese (Regional Setting: Chinese)
System Manufacturer: NVIDIA
System Model: AWRDACPI
BIOS: )Phoenix - Award WorkstationBIOS v6.00PG
Processor: AMD Sempron(tm) Processor 3000+, MMX, 3DNow, ~1.6GHz
Memory: 1536MB RAM
Page File: 708MB used, 2722MB 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

Display Devices
Card name: ATI Radeon HD 2400 PRO
Manufacturer: ATI Technologies Inc.
Chip type: ATI display adapter (0x94C3)
DAC type: Internal DAC(400MHz)
Display Memory: 256.0 MB
Current Mode: 1280 x 900 (16 bit) (60Hz)