it works well for my computer, running SL 10.6.1.
MSI X58 Pro-E motherboard, w/ Intel i920 2.66GHz
Asus 4890 1GB Display Card
LG L1730S LCD (up to 1280*1024)
ATI Radeon HD 4890:
Chipset Model: ATI Radeon HD 4890
Type: GPU
Bus: PCIe
Slot: Slot-1
PCIe Lane Width: x16
VRAM (Total): 1024 MB
Vendor: ATI (0x1002)
Device ID: 0x9460
Revision ID: 0x0000
ROM Revision: 113-B7710C-176
EFI Driver Version: 01.00.318
Displays:
L1730S :
Resolution: 1280 x 1024 @ 60 Hz
Pixel Depth: 32-Bit Color (ARGB8888)
Main Display: Yes
Mirror: Off
Online: Yes
Rotation: Supported
Display Connector:
Status: No Display Connected
but now, my optical driver doesn't work.

thanks!
iRobin
QUOTE (bm2 @ Sep 3 2009, 05:43 AM)

First, you need an enabler, so your card is recognized by OS X.
ATY_Init is the most common, but fails in 64-bit mode.
EVOenabler is both 32 and 64-bit compatible. It's also pre-patched for the 4890:
Click to view attachmentSecond, you need a patched
ATI4800Controller kext, so the "built-in" ATI framebuffer gets activated for your card.
Click to view attachmentThird, you need a patched
ATIRadeonX2000 kext, so acceleration is activated for your card.
Click to view attachmentLastly, to install the linked kexts, unzip them, copy them to
/System/Library/Extensions. Following which, in Terminal.app, execute this code: