When installed in a Mac Pro a stock PC GPU will only be able to utilize the outdated PCIe 1.0 format. A card flashed with a Mac BIOS will be able to work at PCIe 2.0 speeds, supporting twice the data rate. PC ATI 5770/5870 cards flashed to work with Mac Pro. Right out of the box on your mac without the need to flash anything. Working mac graphics card in your system in PCI-E slot 1 just so. This guide is deprecated. Any ATI 5xxx series and I think even ATI 6xxxx series cards excluding the 6890/6990 will work out the box with OSX Lion. I strongly encourage you guys to not use this guide and just upgrade to Lion. Then you can use most Nvidia and ATI cards these days right out of the box on your mac without the need to flash anything. Flashed ATI 5770 (possible for 5870) to work in Macs. I'm using it in Mac Pro 3.1 (early 2008). Apple upgrade is $280. Newegg price for the card is $136. PRICELESS This works on original Macs. Not for hackintoshes. These are the cards you want to use for the seemless flashing: 5870 - 5770 - Here's what needs to be done, not really a huge issue: GUIDE: 1) Get the ATI 5770 or 5870 card linked above. I got the 5770 one. 2) You need to have a working mac graphics card in your system in PCI-E slot 1 just so you can do all this without problems and so you don't need a PC. 3) Insert the 5770 in your mac in PCI-E slot 2 and connect the power cable. 4) If you have an addition hard drive in your mac, or you have an empty HDD or the one you can tinker with, go to Disk Utility and create a partition on it as FAT. You can do this on your main OSX drive too I just don't like messing with Disk Utility and my main drive. But it's possible to just create additional partition there as FAT too. 5) Make a DOS boot disc. The easiest way to do this is to simply go here:. Download Win95B bootdisk ISO ( ). ![]() Burn the image to an EMPTY dvd with Disk Utility. 6) Download ATIFlash 3.79 or later from here: 7) Unzip the ATIFlash 3.79 to the FAT partition you created on your mac. We do this so your hard drive will be visible when you boot in Win95 DOS mode with the DVD. 8) Put the DVD with Win95 boot disc in the drive and reboot your Mac. 9) Hold C to boot from the DVD disc. 10) Once DOS loads up and you see A: type C: to switch to FAT drive you created earlier. 11) Type DIR to list the contents of the drive to see if you see ATIFlash files. If yes, it's all good you are on the right drive, if no, you will need to double check if your hard drive is partitioned ok or if there's another drive letter available like D: or E: or G. 12) Now, when you are at C: and you can see the ATIFlash.exe file on it after the DIR command, you type: atiflash.exe -i to list out all available ATI display adapters in your Mac (just in case you have something beside the 5770 you are flashing). The result should be something like a list view and it should tell you first the adapter number (usually the 5770 will be adapter 0) and the rom size (which should be 20000) and the GPU core will say Juniper. How to put footer on only one page for mac word templates. If you see more then one adapter you have to make sure to note the adapter number for the 5770 Juniper card. 13) Okay, now we are going to backup your existing ROM. In case something goes wrong. We do this by issuing the following command: atiflash -s 0 XFX5770.rom 20000. You would call the file XFX5870.rom if you were dealing with the 5870 card. Let me just explain what's going on here. The -s switch means it will save the rom from the card. The number is the adapter number you would see which is mention one step above. Then we have the name of the rom file and the size (which again should be matching the rom size in the info list we did earlier, and with this card should be 20000). 14) That's about it. Now we have the original ROM saved. We should do another DIR command now and check out to make sure that the rom size in file is 128KB (131 072 B). If you used the cards listed above you should get this without problems. If you don't, well read the ' IF SOMETHING WENT WRONG:' paragraph at the end of this post. 15) Now, reboot to OSX and we will do one small modification to our rom file to make it work with the OSX and then we will reflash the card with that new one and that's gonna be it. 16) Once you have rebooted, you will download the following file 17) Extract the content of the zip file in your home folder on your Mac. ![]() You should see 3 files: 5770_vervet_netkas.efi, 5870_vervet_netkas.efi and fixrom.py. These are the EFIs compatible with the Macs and the small utility tool that will fix your original card's EFI to work with Macs. We are almost there. Now copy the XFX5770.rom file you created with ATIFlash tool to the home folder as well (where the other 3 files you just download are) and make sure you still keep the original copy of the XFX5770.rom somewhere just in case something goes wrong and you need to re-flash your card to the original rom. 19) Mucho awesome!
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