Here is the step by step instructions for installing a SAPPHIRE 100243-1GTXSR Radeon HD 4870 1GB 256-bit GDDR5 PCI Express 2.0 x16 HDCP Ready CrossFire Supported Video Card - Retail (http://www.newegg.com/Product/Product.aspx?Item=N82E16814102815)
PN: 288-20E85-T305A
SKU: 11133-14
I have confirmed that this will work for installing this card into all MacPros.
WARNING: Your secondary DVI port will not work and should NEVER be used if you use this card as it will cause a kernel panic.
NOTICE: I can not promise that this will work for you and/or that nothing will go horribly wrong. Do this at your own risk, but with the reassurance that a noob like me managed to do it and get it working.
These instructions assume you have basic computer skills and that your card is already properly installed inside of the machine you will either be running it on or at least flashing it on.
Things you will need:
1x USB Flash Drive
1X CD-R
1. Download FreeDOS (http://www.ibiblio.org/pub/micro/pc-stuff/freedos/files/distributions/1.0/fdfullcd.iso)
2. Download GPU-Z (http://www.techpowerup.com/downloads/1363/mirrors.php)
3. Download the ROM file for this card (http://spikelite.com/filehost/mac-toxic-4870GB.rom)
4. Download ATIFlash (http://www.techpowerup.com/downloads/1123/mirrors.php)
5. Download the 10.5.6 4870 drivers (http://www.sendspace.com/file/gvsi12)
6. Install the 10.5.6 4870 drivers on your Mac by double clicking the .pkg that you downloaded. IMPORTANT: During the installation watch for the "Customize" button. It should be on the 3rd screen. Click it and uncheck the last check box, "Natit".
7. Burn the .iso file for FreeDOS to your CD-R
8. Copy the ROM file, GPU-Z and ATIFlash to your USB flash drive
9. Ensure that the only video card in the box you want to flash this video card is the 4870
10. (Optional but very highly recommended) Run the GPU-Z.exe and click the little green arrow and save the .bin file it gives you to your USB flash drive. Note that this is a windows application and as such you will need to be on a windows box, running parallels, or some other form of emulation.
I did this on a Windows Server 2008 box and it worked fine.
Once you have the .bin make sure it is larger then 64 KB. If it isn't then proceed to post for help.
11. Boot the box that you will be flashing the card in onto the FreeDOS cd. Use option #1 when prompted then #4 at the next screen.
12. I named my USB drive "C" but depending on what you named your this next step will very a little. Type C: or DRIVENAME: and hit enter once you get the DOS prompt.
Next type cd ati and hit tab twice followed by enter once it auto completes the rest of the line.
Now type atiflash.exe -p -fs -fp 0 DRIVENAME:\mac-toxic-4870GB.rom then hit tab twice and then press enter. Obviously DRIVENAME should be the name of your drive, in my case it was C:\mac-toxic-4870GB.rom
It should spew out a list of Old and New information. These may or may not be different. Mine were the same, I don't know why but when i found it to work I stopped asking questions and tanked my lucky stars.
13. Restart your computer and enjoy! It really is this simple, until something goes horribly wrong. But I hope that nothing does go wrong for you. If you have questions this community is very friendly and should be able to answer them. You can also PM me tho who knows if I will respond >_<
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