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can somone help me to find the nvidia dcb tables to get other cards working in a imac 27 inch

or with what program can i dissasamble the bios or where in the hex file are the dcb tables

i post the bios of the replacement card a gt240 and the original apple gt120

Another new driver:

https://images.nvidia.com/mac/pkg/387/WebDriver-387.10.10.10.40.137.pkg

New driver for Security Update 2020-003 https://images.nvidia.com/mac/pkg/387/WebDriver-387.10.10.10.40.136.pkg

(For the 2 of us still rocking an Nvidia card…)

Boomish,

Check this thread : https://forums.macrumors.com/threads/strange-audio-issue-on-mp-4-1-5-1-mojave-10-14-4.2176792/



The solution is to change the CPUs

Didn't need to set the date for High Sierra, I think that's for older Mac OS versions. For HS all I needed was to unplug the ethernet cable / disconnect wifi, otherwise installer forces Mojave. Strange and stupid, but it's true.

Sharing my successful experience with flashing Gigabyte R9 280X rev 2.0 to 7950. Even though it looks scary, it's really simple.

Steps I took:

- download the script from the page 1.
- dump the rom with ati win flash utility. I used a separate windows 10 machine
- put the card back to mac and copy the original rom the the folder with the script and run it.
- script creates fixed efi rom which I then flash on windows box (obviously I switch the card back again to windows 10 machine).
- after flashing is complete, I return the card to MacOS and voila... bootscreen.

A few notes:

- As R9 280X is 7970, while the rom is based on 7950, it will be slightly slower. My Geekbench OpenCL compute test went from 36019 to 34261. Not a big deal
- Rominator posted MAC7970.ROM on this forum but I wasn't sure how to use it so I didn't risk it.

I considered renaming it from MAC7970.ROM to MAC7970.efi and running it with the "--efifile=MAC7970.efi" part of the command from first page but I didn't want to brick my card. If anyone has some tips for using the 7970 that would be great.

Anyway, lots of pages to read so I wanted to summarize for new readers. All you need is page one scripts and instructions and ORIGINAL rom from your card. Don't risk using premade ones from other cards, it's not worth the risk. This is a lot easier to do than it looks

Cheers!

Try setting manually date a few months/years back.

The problem is an expired certificate; you can't use older downloads after longer time.

Figured it out. If you want to clean install Mac OS High Sierra, do not have the ethernet cable connected or wifi enabled! Otherwise you may get: "This copy of the Install macOS application is to old to be opened on this version of macOS."

Another crazy thing happened yesterday, I installed El Capitan than initiated HS upgrade from US within the OS. After installation completed it showed that Mojave was installed and not High Sierra. It looks like Apple is forcing installer to install Mojave instead of HS. Hope this helps someone.

This may have been mentioned before but I can't find it. I had trouble installing High Sierra after upgrading firmware. When booting the installer I would get an error: "This copy of the Install macOS application is to old to be opened on this version of macOS."

To make things weirder, I could install HS with 4,1 firmware if using High Sierra patcher. But not after upgrading firmware to 5,1.

The only way I managed to install it was to first install El Capitan and then upgrade to HS, which is what I'm doing now. And when I ran the install it first prompted me to do a firmware update from the MacOS HS installer itself.

Anyone else had similar issues?

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