Hi! Can somebody tell me how get ATi Radeon X1950 (PCIe) QE/CI work?

i am bored to use only 1024x764 Resolution

Display:

Type: Display
Bus: PCIe
PCIe Lane Width: x16
VRAM (Total): 256 MB
Vendor: ATI (0x1002)
Device ID: 0x7280
Revision ID: 0x009a
Kernel Extension Info: No Kext Loaded
Displays:
Display:
Resolution: 1024 x 768
Depth: 32-bit Color
Core Image: Software
Main Display: Yes
Mirror: Off
Online: Yes
Quartz Extreme: Not Supported

thanks and sorry my bad english!

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Leopard 10.5.2 - AMD Athlon X2 5600+ @ 3.01Ghz - 4Gb DDR2 800Mhz - ATi Radeon HD3870 512Mb GDDR4 - 2 SATA HDD 80Gb + 320Gb.