iM 4,1-14,4 2011 iMac Graphics Card Upgrade

[grosmario]

Hi, i have a iMac 21,5 2011 Model and i installed a RX 560 (TYPE A) from a Sonnet Breakaway Puck. Now it boots with a black screen. External Monitor connected over Thunderbolt works fine. Is there a custom bios wich would work for this card?

Link to my Bios

backup.rom

drive.google.com

hi,
i added gop (missing)to your rom from winraid forum : GOP_Updater_v1.9.6.5.k_mod_v0.5.2
i didn t do anything to this file ,just ran it : compare these two file or run but yourself in windows 10;

 

[Lpumg]

Hi, please forgive me if this post doesn't belong here. I have a 2009 Imac 27" i7-860. I upgraded the graphics card to an RX480.
I flashed the EG vBIOS for the graphics card, and it works flawlessly, including the brightness control.
!!!But after the upgrade, a CPU issue developed: the i7-860 runs at 1197 MHz (minimum 9x multiplier) instead of 2800 MHz.

During the Valley test, the CPU and GPU don't even get warm. And the test results are even lower than with the original HD 5750 GPU.
The issue is definitely related to the graphics card upgrade; all temperature sensors are connected correctly. I tried restoring everything to its original state (returning the original graphics card), and after that, the processor runs at its normal frequency (2800 MHz).
Any ideas?

 

[Jani8022]

hi,
i added gop (missing)to your rom from winraid forum : GOP_Updater_v1.9.6.5.k_mod_v0.5.2
i didn t do anything to this file ,just ran it : compare these two file or run but yourself in windows 10;

Thank you very much Mario! I flashed your edited ROM and the result is the same. External Monitor works, internal is Black