I used efi rom from new imac’s 5750 and original 5770 pc rom to create custom hybrid rom.It works in osx, no injector used.Since I used mobility ATI rom we have nothing from card on boot, but once osx booted – the card works.Both dvi ports work, displayport works too, 3 displays doesnt work atm.Once we have macpro’s 5770/5870 roms boot screen should work too. But for now you can already enjoy 5770 in your macpro.It only works on 2008+ macpros, because efi is 64-bit now, not ebc anymore.screenshots and the rom:before flashing you also need to install.Also, 5870 is working too in macpro.XFX 5870. Success!Model Name:Mac ProModel Identifier:MacPro3,1Processor Name:Quad-Core Intel XeonProcessor Speed:2.8 GHzNumber Of Processors:2Total Number Of Cores:8L2 Cache (per processor):12 MBMemory:12 GBBus Speed:1.6 GHzBoot ROM Version:MP31.006C.B05SMC Version (system):1.25f4Thanks to Netkas ROM 5770, the Gigabyte card GV-R577UD-1GD HD5770, worked perfectly. I just would like to know how are you guys solving the problem with the cables.
![](/uploads/1/2/6/3/126307399/704396497.jpg)
Jul 01, 2014 Re: make your own radeon HD 5770/5870/6870/6850 Mac ROM! « Reply #325 on: June 13, 2014, 03:54:04 AM » I would recommend flashing it to the stock PC rom that you can find on the internet, then proceed with the steps in the first page of this forum post. Hello friends, not getting the expected editing-performance with Adobe Premiere Pro and After Effects 5.1 on my 2.666 12-core 2010 with an Ati Radeon 5870 I think about getting the Nvidia Quadro 4000 (which might be good for Avid Media Composer too).
![Mac Mac](http://weekendsoundtrack.co.uk/images/5870refa.jpg)
I upgraded from an ATI Radeon HD 4870 (Mac Version) which already had the power cables. I’d like to buy a new set of cables to use the 4870 in another macpro. Can somebody tell me where can I find them?Test DVI portsGreetings and Netkas, you are the BEST!!!!. Successfully flashed a Sapphire 5870 Vapor-X.The main difficulty was getting to a DOS prompt. In the end, I used the standard FreeDOS ISO file and burned it to a CD. I initially wanted to use a USB stick, but no matter what I tried, the Mac would not see it as a boot device.When launching FreeDOS, select 1 to run FreeDOS, then 1 again to “install”. Select keyboard and then select LiveCD option.Once at the command prompt, you can just plug a USB stick (it’ll mount in A:) with atiflash and the ROM file and get flashing.Thanks Netkas and others and good luck on getting the EFI screen loading!.
![](/uploads/1/2/6/3/126307399/704396497.jpg)