In that type of Mac the video card is in a standard expansion slot so it can be easily replaced with a better one. In OS X 10.8.3 or later you can use a wide range of PC graphics cards in an aluminum Mac Pro; it used to be that you could only use graphics cards specifically flashed for Macs.

Well since i successfully pimped out my Mac Pro with 2 8800GT PC cards I would like to write down a quick tutorial for anyone who doesn't want to pay $350 to Apple for 8800GT option. For this you will need to do/get following: IMPORTANT: Don't start doing things right away before you read every point in my guide here.

1x PC 8800GT card with G92 chip (all newer 8xxx series of cards are G92 like 8800GT or 8800GTS 512mb) - the one I'm working with is 2. You will need Mac 3.

For FreeDos from their site 4. You will also need to download for flashing (5.63 version) 5. And of course for the card 6. Next since you need to burn the above.iso you will need to make a bootable disc that will contain eveyrthing you downloaded. From nvFlash to FreeDOS. The best app on PC to do that quickly would be.

And point to.ISO file. Once you do that, you will see the files in the right window of UltraISO.

You can now drag the remaining files from nvFlash folder to the root of that virtual disc (in right window) and also copy the mp8800gt.rom file you unzipped as well. When you drag the nvFlash from your 5.63 folder you can freely overwrite the files in UltraISO from the 8800GT_flash_toMac.zip files because they contain the older nvFlash. Then in UltraISO got to TOOLS>Burn CD/DVD/Image and click BURN on the next window that will appear. Once you burned that sucka, pop it into your Mac Pro and reboot holding ALT key. Once you get to the boot menu between Windows Mac CD or Windows with CD-ROM icon pick the CD-ROM icon to boot from the DVD. Press enter to continue booting from the CD/DVD 9.

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Then follow these steps: - click '1': continue to boot Free DOS from CD-ROM - click '1': Install to hard disk using Free Dos setup ( Default ) - don't worry it won't install anything - point to '1' to choose English (US) keyboard - point to run Free Dos From CD-ROM and hit enter 10. Once you see X: or some other letter follow by: type the following: nvFlash --check you should see some text appear and you need to pay attention to that the nvFlash identifies your card as GeForce 8800GT if you have another card in the system. For example if you have 2 GeForce 8800GT card in the system it will ask you Select Display Adapter: 8800GT and 8800 GT. Is the card in the primary slot. This just means that the app needs to know what card to query. If you have ATI card already in there you can plug your monitor into it it won't matter and you can actually see the whole process even if something gets fookered up God forbid, but I'm sure you'll be fine. The nvFlash should recognize only GeForce 8800GT you have in there.

Just make sure the card you are flashing is in the PCI-E primary slot. --check parameter will actually identify your card/s and show you what EEPROM you have.

If you see 1024Kx1S in the line below Identifying EEPROM. You are GOOD TO GO because the EEPROM on that GeForce 8800GT is 1mb which is in sync with the Mac version of BIOS for the 8800GT. If you see smaller one like 32k or 64k or anything smaller then 1024k it's no good. You can't flash that card (it's older version) 11. Now you are ready to flash. Usually you would be wise to backup your existing EEPROM with nvFlash if you have a USB drive or something hooked up to your Mac Pro, but otherwise you will need to be able to write to FAT compatible hard disk and I think the only you would be doing that is on PC. I'm not going to go through that now but if you wish to backup your EEPROM from the card you are just about to flash and you have the USB drive connected to Mac Pro and you can see from the DOS you should type this nVFlash --save Z:/old8800gt.rom where Z:/ would be your USB drive.