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ในที่สุดก็ทำได้ 4890 on MacPro (MacPro1,1) 2006-2008
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The old post have now been removed.
Instructions for flashing ATI 4890 with ATI Flashing Tool
First backup the rom with GPU-Z in windows. its good if your card is not compatible with the roms in the zip
If you have Nvidia cards in your Mac Pro at the moment:
1. read http://forums.macrumors.com/showthread.php?t=811768
2. download zip, unzip it
3. launch tool
4. browse for rom (ROM folder is included in zip)
5. click flash
6. install qe_ci pkg for your OS
7. reboot
8. done.
If you have ATI cards in your Mac Pro at the moment:
1. read http://forums.macrumors.com/showthread.php?t=811768
2. download zip, unzip it
3. launch tool
4. go to injector and install Natit
5. shut down mac pro
6. remove all ati cards, put only your 4890 inside
7. boot again
8. launch tool
9. browse for rom (ROM folder is included in zip)
10. click flash
11. go to injector again, now Remove Natit
12. install qe_ci pkg for your OS
13. reboot
17. done.
WHAT WORKS AND WHAT DOESN'T
Dual Dvi (two displays) work in Snow Leopard ONLY. Second DVI only gets Single Link resolution in OSX (dual link in Windows).
Vga does not work (VGA monitor using VGA-DVI adapter) in OSX, Windows should be ok
Questions:
Why do I need to remove my ATI cards?
Because the app will try to flash all ATI cards it finds.
Why do I need Natit when I'm currently using ATI cards?
Since you need to remove other ATI cards, you need something to run the display when you boot and flash.
Natit enables you to boot and use 4890 for display without flashing it.
Why can't I just use Natit then?
You can, but you won't get Apple's grey bootloader screen. You also can't boot OSX dvd's, or use the card in another computer / OS disk without first installing Natit on it. With flashing, your card can do all these things. So now we only use Natit to be able to remove ATI cards and still boot, or to run cards that not yet have a modified ROM that is working.
Can I donate to you?
Yes, and it makes me very happy.
Unsure of what card to buy?
Here are the cards that have Mac Modified roms at the moment.
(Your card can look the same but still be incompatible, so first you should backup ROM with GPU-Z in Windows, if it doesnt work maybe someone will write a new rom for you)

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HOW TO GET HELP
Have you followed instructions, but something is not working?
To provide complete information of your system, increases the chance of solving your problem, and also speeds things up.
When asking questions regarding errors, provide:
Mac Pro model (1,1 / 2,1 / 3,1 and so on, not processor speed)
Graphic card model number
Does the card work in Windows?
Picture of your graphic card
Name of rom you flashed with
and if possible:
Picture of System Info --> GPU with card connected
Original rom from your card
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