Carte graphique

Bonjour, je voudrais upgrader ma carte graphique pour une meilleure. Je joue principalement a WOW. Ma carte est une Radeon HD 4600. Voici les specs de mon ordi:

Specifications
Part Number: DX4820Gateway DX4820 Desktop Series
Following are the specifications for the Gateway(R) DX4820 desktop series.
Specifications are subject to change without notice or obligation.

Feature Specification
Operating System1 Genuine Microsoft(R) Windows Vista(R) Home Premium 64-Bit2 (Service Pack 1)
Genuine Microsoft(R) Windows Vista(R) Home Basic (Service Pack 1)
Processor1 Intel(R) Core?2 Quad processor (up to 1333 MHz FSB)
Intel Core2 Duo processor (up to 1333 MHz FSB)
Intel Pentium(R) processor
Chipset Intel(R) G43 Express chipset
Memory1 Up to 8 GB of DDR3 1066 MHz SDRAM (dual-channel support, four DIMM slots)
Hard Drive1 Serial ATA hard disk up to 1 TB1 per 3.5-inch drive (four internal hard drive bays)
RAID 0, RAID 1, RAID 5 and RAID 10 support3
Optical Drive1 Optical drive options:
Blu-ray? and SuperMulti DVD burner combination drive
Blu-ray reader / SuperMulti DVD burner combination drive
SuperMulti drive with Labelflash? technology
DVD-ROM drive
Media Card Reader Multi-in-one card reader, supporting:
CompactFlash(R) (Type I and II)
CF ? Microdrive
MultiMediaCard (MMC)
MMCplus?
MMCplus? HC
MMCmobile?
MMCmobile? HC
Reduced-Size MultiMediaCard (RS-MMC)
Secure Digital? (SD) Card
miniSD? Card
miniSD? Card HC
microSD? Card HC
SmartMedia?
xD-Picture Card?
Memory Stick(R)
Memory Stick PRO?
Memory Stick Duo?
Memory Stick PRO Duo?
Expansion Bays Two external 5.25-inch
Four internal 3.5-inch (hard drive bays)
Graphics PCI Express(R) 2.0 X16 graphics card support
Discrete card support for NVIDIA(R) and ATI? graphic cards
Microsoft(R) DirectX(R) 10 support
Audio Embedded high-definition audio with 7.1-channel surround sound support
S/PDIF (Sony/Philips Digital Interface) support
Network Support LAN: Gigabit Ethernet
WLAN: IEEE 802.11b/g1 (internal antenna option)
Modem1 56K ITU V.92, Wake-on-Ring ready
Front I/O Ports Multi-in-one card reader
Photo Frame button
Four USB 2.0 ports
High-definition headphone and microphone jacks
Rear I/O Ports Four USB 2.0 ports
Two PS/2 ports (keyboard and mouse)
Ethernet (RJ-45) LAN port
IEEE 1394 port (6-pin)
Six audio ports
D-sub VGA port
HDMI? port
Add-In Card Slots One PCI Express 2.0 X16
One PCI Express 2.0 X1
Two PCI 2.0 conventional
Power Supply 300 or 500 watt
BIOS AMI PnP BIOS compatible with SMBIOS 2.6
System Compliance PC 2001, ENERGY STAR(R) 5.0
Dimensions (W X D X H) 7.1 X 16.3 X 16.3 inches (180 X 413.2 X 412.4 mm)
Certification FCC, CE, BSMI, CCC, VCCI, CB, MET
Software Gateway Photo Frame
Gateway Games
Gateway Recovery Management
Adobe(R) Reader(R)
Cyberlink(R) Power2Go
Cyberlink Label Print (included with Labelflash drive)
Google Toolbar and Desktop Search
Microsoft(R) Works 9.0 and Office Home 2007 Trial
Microsoft Money Essentials
Norton 360? All-in-One Security suite (60-day trial)
Optional Accessories Gateway keyboard and mouse
Gateway LCD monitor
Media Center remote control
Specifications vary depending on model.
64-bit software is required to enjoy the advantages of 64-bit processing.
Support for RAID 0 and 1 requires two hard drives, RAID 5 requires three, and RAID10 requires four.

Power supply: 300W