Carte graphique ET les Jeux

Bonjour,
svp j'ai besoin une idée à propos de mon pc pour lui rendre plus efficace avec les nouveaux jeux car je ne peux plus jouer à cause de ma carte graphique.donc la question est ce que je peux resoudre ce problème avec une nouvelle carte ( qu'elle carte je doit choisir avec un prix raisonnable ) ou ajouter une ram 1G ....?
que j doi faire pour rendre le pc plus performan?
voila ma config:
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System Information
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Time of this report: 3/12/2008, 11:27:52
Machine name: STANDARD
Operating System: Windows XP Professional (5.1, Build 2600) Service Pack 2
Language: French (Regional Setting: French)
System Manufacturer: Dell Computer Corporation
System Model: Dimension 4600
BIOS: Phoenix ROM BIOS PLUS Version 1.10 A03
Processor: Intel(R) Pentium(R) 4 CPU 2.80GHz (2 CPUs)
Memory: 766MB RAM
Page File: 371MB used, 1505MB available

DirectX Version: DirectX 9.0c (4.09.0000.0904)

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Display Devices
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Card name: NVIDIA GeForce FX 5200
Manufacturer: NVIDIA
Chip type: GeForce FX 5200
DAC type: Integrated RAMDAC
Device Key: Enum\PCI\VEN_10DE&DEV_0322&SUBSYS_01B910DE&REV_A1
Display Memory: 128.0 MB
Current Mode: 1024 x 768 (32 bit) (75Hz)
Monitor: ةcran Plug-and-Play
Monitor Max Res: 1600,1200
Driver Name: nv4_disp.dll
Driver Version: 6.14.0011.6921 (English)
DDI Version: 9 (or higher)
Driver Attributes: Final Retail
Driver Date/Size: 12/5/2007 01:41:00, 5773568 bytes
WHQL Logo'd: Yes
WHQL Date Stamp: n/a
VDD: n/a
Mini VDD: nv4_mini.sys
Mini VDD Date: 12/5/2007 01:41:00, 7435392 bytes
Device Identifier: {D7B71E3E-4062-11CF-6768-B22100C2CB35}
Vendor ID: 0x10DE
Device ID: 0x0322
SubSys ID: 0x01B910DE
Revision ID: 0x00A1
Revision ID: 0x00A1
Video Accel: ModeMPEG2_A ModeMPEG2_B ModeMPEG2_C ModeMPEG2_D

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Sound Devices
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Description: SoundMAX Digital Audio
Default Sound Playback: Yes
Default Voice Playback: Yes
Hardware ID: PCI\VEN_8086&DEV_24D5&SUBSYS_01551028&REV_02
Manufacturer ID: 1
Product ID: 100
Type: WDM
Driver Name: smwdm.sys
Driver Version: 5.12.0001.3600 (English)
Driver Attributes: Final Retail
WHQL Logo'd: No
Date and Size: 5/6/2003 09:14:34, 580992 bytes
Other Files:
Driver Provider: Analog Devices
HW Accel Level: Full
Cap Flags: 0xB5B
Min/Max Sample Rate: 8000, 96000
Static/Strm HW Mix Bufs: 1, 0
Static/Strm HW 3D Bufs: 0, 0
HW Memory: 0
Voice Management: No
EAX(tm) 2.0 Listen/Src: No, No
I3DL2(tm) Listen/Src: No, No
Sensaura(tm) ZoomFX(tm): No
Registry: OK
Sound Test Result: Not run