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There is no support for UEFI Windows on these cards. Only legacy works.

Hello Guys:

I have a Problem with Mac Pro 4.1(5.1).

I have flashed 2x Graphic Cards wit mac EFI ROM to have a Boot Screen:

MSI R9 280 GAMING 3G
MSI R9 280X GAMING 3G

Both Graphic Cards works very good in MacOS Mojave, but as soon i start Windows 10 on the Mac Pro, i get a black Screen and the Mac Pro reboots.
With the stock Windows GPU BIOS on both cards - Windows boots just fine.

What can it be?

Thanks

Well, it needs 10.8.3 and mountain lion doesn't support 1,1 or 1,2...officially.

Sapphire AMD Apple Radeon HD 7950 flashed ,working perfectly for DVI display ,not working HDMI,and Display port ,this issues was because flashing or some other else

New driver for Security update 002.2020: https://images.nvidia.com/mac/pkg/387/WebDriver-387.10.10.10.40.135.pkg

Hi. Would you send me your K600 EFI ROM?
I have also an K600 and would also make some testing.

Thanks

Hey Rominator,

Since it seems flashed PC MXM cards look unlikely to ever ship from macvid cards and the 27" 2009/2011 iMacs are getting very long in the tooth, how about open-sourcing the roms you have developed so far and letting the community take a crack at finishing the work?

I’ve got a much-loved vintage 2009 27” iMac with a partly dead HD4850 512 MB GPU (no acceleration) and a new old-stock Dell Alienware M17x R1 R2 AMD Radeon HD 4870 1 GB GPU.  I also have the MXM-PCIe hardware adapter and Rpi to flash the Alienware MXM to a mac efi rom, but I don’t have a rom.

I’m a hardware guy and not into firmware but if I could read some background and get pointers in the right direction, maybe I could build a rom to keep both this old 27" Mac and the Alienware card out of landfill.

So you know the next question!   Is this a doable proposition from your PoV, or do you see it as stealing your work?  From my PoV, why build the wheel twice when a lot of the work has been done (by you) already. The rest of us could stand on the "shoulders of (you and Netkas) giants" to see a little further (apologies to Newton).

I have a Wx7100 in mine and I love it. It works very well, is quiet and not power hungry at all. Tom's Hardware did a good writeup on the pcb improvements on this VS the 480/580.

Imac 4.1 20" 2006 bootRom-Im41.0055.B08 ,SMC-1.1F5 , 2ghz intel core duo, DRR2 2x 1GB ram, Mac OSX 10-5-8.

I'd like  to update it to imac 5.1 with iMac4,1 and iMac5,1 Firmware Tool Released taken from the forum but I cannot do it, the application won't start, does nothing, a popup windows appears ":Unexpectable finished working".

I've got a question if I need to change the processor to intel core 2 duo first and then try to install iMac4,1 and iMac5,1 Firmware Tool Released. Will it work then?

Thanks a lot, I'll try when I've some free time!

Actually try the one attached, I made it from your original, make sure you have a backup first