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

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The first post of this thread is a WikiPost and can be edited by anyone with the appropiate permissions. Your edits will be public.
Nick [D]vB
I cannot get sound on Windos 10x64 in EFI mode. (I do not want to use BIOS\Legasy mode. Because of longtime boot screen).
( According to post).
The DSDT patch is very complicated for me.
Please tell me, did you receive a registry modification for Windows?
Or maybe other simple methods have appeared?
(I was absent from the forum for a long time.)
And although in accordance with this post of Zulus555, he had no problems, I can not achieve a positive result.
Maybe someone will comment.
 
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Ausdauersportler said:
Hi!

In your position I would try a small 1-4GB SD card or another USB flash drive. The K2100M flash image should be fine, all flash utilities do to my knowledge a check, i.e. write, read, compare. From all the cards I checked and tested these small Quadro cards are the most reliable ones. You can even use them without a complex fan management, because the heat production even during a Valley benchmark is small (30W with the K2100M, less with K1100M and K610M). This may not apply in areas with hot and humid summers, but I live in central Europe and even climate change is not that fast.

Always: If you face problems first redo the software setup, then change hardware parts to fence out human or hardware errors.

Hope you get it running, soon!
Click to expand...

I took your advice regarding an SD card (I actually only had a 64GB card from my old phone), and so far so good regarding the booting - it is smooth and goes straight into MacOS with no OpenCore error messages. And it frees up a USB slot (I never use the SD slot anyway), so it's an improvement! However I still can't switch out of Target Display Mode - to be fair I've only tried it with my PC using a USB-C->mDP cable, so it might be an issue of compatibility with the PC? I should get a mDP-mDP cable and try with my Macbook Air.
 
Murometc said:
Nick [D]vB
I cannot get sound on Windos 10x64 in EFI mode. (I do not want to use BIOS\Legasy mode. Because of longtime boot screen).
( According to post).
The DSDT patch is very complicated for me.
Please tell me, did you receive a registry modification for Windows?
Or maybe other simple methods have appeared?
(I was absent from the forum for a long time.)
And although in accordance with this post of Zulus555, he had no problems, I can not achieve a positive result.
Maybe someone will comment.
Click to expand...
Did you try this: https://apple.stackexchange.com/que...-hybrid-gpt-mbr-format-when-usi/352428#352428 ?
 
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Murometc said:
Nick [D]vB
I cannot get sound on Windos 10x64 in EFI mode. (I do not want to use BIOS\Legasy mode. Because of longtime boot screen).
( According to post).
The DSDT patch is very complicated for me.
Please tell me, did you receive a registry modification for Windows?
Or maybe other simple methods have appeared?
(I was absent from the forum for a long time.)
And although in accordance with this post of Zulus555, he had no problems, I can not achieve a positive result.
Maybe someone will comment.
Click to expand...
First page, first post, using the Catalina Bootloader with OpenCore - or try the Legacy installation. I wrote the very same on this page some posts back...Windows 10 Audio needs Legacy installation or the DSDT patch or OpenCore, take your pick.
 
herrdude said:
The fact that people are installing all the cards on the first page in 2010-2011 (even 2009 in some cases) should tell us that it will work.
Click to expand...

Sorry to ask the question again @herrdude and @Ausdauersportler, but are you sure? I've finally opened up the iMac, and it doesn't look like the AMD card from my 2010 27" iMac will fit on the heatsink of the 2011 21.5" iMac - here are the two cards side by side.

20200624_114741.jpg
 
Roman78 said:
Left one is a HD5750 iMac 27" 2010
right one is a HD6750 iMac 2011
Click to expand...

Yes I know (as I've pulled them from both these machines!), my question is because a few days ago I asked - before I had taken apart the 2011 21.5" iMac - whether I could replace its old busted HD6750 with my old HD5750. I was told that it was possible as they were both MXM, but perhaps I was not 100% clear that they were not from different sizes' iMacs.
Just to check, there is no way this will work no?

Is my only choice a smaller card like the K1100M or K2100M? They're not so easy to find outside of US/China...Or perhaps baking the card, but the 2011 iMac (unlike the 2010) is such a pain to dismantle that I'd rather not have to do this again if it's not a permanent solution.
 
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On the 21,5" only the smaller cards will fit, if you don't want to modify the case and remove the 3,5" hard disk. On the 27" both, small and bidder cards will fit and work. The HD5750 will also work in the 21,5" 2011, but you need to modify the internals a little.
 
Roman78 said:
On the 21,5" only the smaller cards will fit, if you don't want to modify the case and remove the 3,5" hard disk. On the 27" both, small and bidder cards will fit and work. The HD5750 will also work in the 21,5" 2011, but you need to modify the internals a little.
Click to expand...

Thanks a lot for this - the 3.5 drive is getting replaced by a 2.5 SSD anyway, but I'm not sure I want to modify the case (or how I would go about it anyway). I don't suppose anyone in the UK/Europe has a spare K1100M/K2100M they're willing to sell then?
 
herrdude said:
Did you try this: https://apple.stackexchange.com/que...-hybrid-gpt-mbr-format-when-usi/352428#352428 ?
Click to expand...
Yes of course. I still work like that. (Narrated in my signature).
This method assumes a clean installation of Windows in MBR / BIOS / Legasy mode.
I want to use GPT / EFI mode for a clean installation of Windows. (The reason I explained above).
Ausdauersportler said:
...Windows 10 Audio needs Legacy installation or the DSDT patch or OpenCore, take your pick.
Click to expand...
The DSDT patch remains, but these are complex, difficult manipulations.
Thank you for your help.
 
Murometc said:
Yes of course. I still work like that. (Narrated in my signature).
This method assumes a clean installation of Windows in MBR / BIOS / Legasy mode.
I want to use GPT / EFI mode for a clean installation of Windows. (The reason I explained above).

The DSDT patch remains, but these are complex, difficult manipulations.
Thank you for your help.
Click to expand...
Have you tried to copy the Catalina Loader? No manipulations, no added kernel extensions, it is just doing the DSDT patch for you.
 
Inspiring said:
Hi All, I have a question regarding external displays - I have K1100M on iMac 27 2011, running Dosdude1's Catalina Patch, custom bios and OpenCore loader all working fine, when connecting to an external HDMI monitor, the mini-dp to HDMI cable works fine, graphics shows.

However when used with Apple's LED Cinema Display (27-Inch)(non thunderbolt), I can only get Bootcamp Windows to show up on the Cinema Display. When in Catalina 10.15.4 (With OpenCore or not), the Cinema Display remains undetected (either from OpenCore or not). When in High Sierra with or without OpenCore, it works fine.

This is really strange as it is only Catalina that it is having problem with.

Any one can shed some light? Thanks.

View attachment 924366
Click to expand...

I have pinned down the problem that:

K1100M is indeed dual-mode, supporting both HDMI and Mini DisplayPort signal.

High Sierra, with K1100M, iMac 207 2011, Custom Bios, OpenCore or not => Outputs successfully to Mini Display Port, 4k @ 60 hz

Catalina with Dosdude1 patch, with K1100M, iMac 207 2011, Custom Bios, OpenCore or not => Doesn't output to Display port, only output via Mini-DisplayPort to HDMI signal, 4k @ 30hz max using MDP=>HDMI 2.0 Cable.

Does any one know how I should work out what went wrong? It appears that the OS was loading some module that prevented DisplayPort output.
 
Ausdauersportler said:
Download and read the docs.
Click to expand...
OK, I will try to understand.
If I have any questions, can you help?
My Mac does not have any MacOS installed.
Can I do the procedures from under Windows 10?
Or will I have to install MakOS in addition?
(Perhaps my questions are very naive. This is because I do not own the work on MacOS operating systems at all).
 
So on the first page WIKI it says that the 860M can get boot screen with Opencore but in the boot screen section it says the opposite. Is there a specific post about how to get boot screen on the 860M with opencore?
 
Rassmusen said:
So on the first page WIKI it says that the 860M can get boot screen with Opencore but in the boot screen section it says the opposite. Is there a specific post about how to get boot screen on the 860M with opencore?
Click to expand...
I found out by using AMD cards that - while booting the OpenCore Catalina Bootloader - you have in any case the OpenCore boot selector. Some Nvidia cards offer EFI boot screen (i.e. pressing alt/option on boot). Cards having no such EFI boot screen can always use the Catalina Loader.
Long story short: I got an emulated boot selector using OpenCore while playing around with a K3100M. It should work with every other Kepler card, too. Use an external SD card :) Deselect all kernel extensions.
 
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