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iM 4,1-14,4 2011 iMac Graphics Card Upgrade
- Thread starter MichaelDT
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In case you do already have UEFI booted Windows installed (not the normal Bootcamp way!) you can do it from there, otherwise the GRML Linux version linked to in the first post will do the job. Follow the instructions and be patient!
There is also a way to do it from OCLP launched UEFI shell as well, but it's not "supported" by the community here.
If you are going to buy one, the best way will be having the seller flash it for you.
Hello there everybody. I installed Big Sur with OCLP in a 27 2009 imac with the original ati card. The card failed so I bought an amd m6100 from aliexpress (maybe already flashed). Now the mac boots fine, I have original AND oclp boot picker, high sierra works fine but in big sur everything is laggy as no hardware acceleration available. I tried to reflash OCLP forcing AMD GCN in the advanced tab but to no avail. Could you please tell me what am I supposed to do? I hope I don't have to reinstall BIG SUR from scratch.
Thanks in advance
Thanks in advance
Catalina loader work but if i try to put opencore dmg to work brightenss imac sto the line progress
which iMac ist it? if it is a 2011 and you want to use Catalina go for the dos dude Catalina installer, it will provide working power management. If it"s a 2009 or 2010 go for open core - create the install usb (Big Sur and up to Ventura) from high Sierra- , did both successfully with a k1100m
Made a video testing s7100x vs K3100m, both card undervolted with a slight memory clock increase (well, quite huge on the K3100m actually)
Next up i will publish guides on how to undervolt them, to prevent the need for additional heatpipes and ensure longer operation.
Next up i will publish guides on how to undervolt them, to prevent the need for additional heatpipes and ensure longer operation.
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According to this post #16,282 you'll have to solder a bigger VBIOS EEPROM to your card first.
I'll tried but no success and drop finally a M5950 because there no vbios that works,maybe later.Finally i tried a K3100m,V4 bios are no response then i use a some .BFR version from nikey22 and its run!i damage a original eeprom from micronix mx25l2006e and i stuck for the moment then i have a damaged 1TB HDD electronics from imac where i find a winbond W25x40cl and go for it,flash and resolder - bingo!its run,install a oclp ventura,mac fans control and it works perfectly,but windows 10 installation gave a blue screen 
i have two A1312, in second i want install a wx7100 but i dont get to the end a hot wire mod and what eeprom to desolder for program,i have dell version 308 or something like that,ot has 2 eeproms on pcb,maybe when i install win10 finally and change k3100m for wx7100 re flash in win10?or only solder-de solder and change vbios rom on ch341a?
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Can anyone, please, help me? i've got an iMac 27" 2011 12,2 few days ago with GTX 765M installed in it. I've tried to install macOS Big Sur using OCLP, with no luck (i've got the video, but acceleration seems to be not working at all).
Card has vbios flashed by nick[d], i was able to get it to work with clean High Sierra install, then i installed mac os catalina with catalina patcher. Tried to boot high sierra or catalina with OCLP - no luck, it just stacks, without OCLP it boots normally. Maybe i should add some args to oclp settings to get this Kepler GTX 765M work? Any advise?
By the way, i've got second question about RX480 placed in A1312 2009/2010. I've got 4GB version, flashed WX7100_GOP_4GB.ROM, got ventura + windows 10 installation, but has high frequency drops (1200 to 300), it seems to me, that i need to downvolt this a little bit, as far as i understand, the only way to do so, is to use polaris bios editor?
Card has vbios flashed by nick[d], i was able to get it to work with clean High Sierra install, then i installed mac os catalina with catalina patcher. Tried to boot high sierra or catalina with OCLP - no luck, it just stacks, without OCLP it boots normally. Maybe i should add some args to oclp settings to get this Kepler GTX 765M work? Any advise?
By the way, i've got second question about RX480 placed in A1312 2009/2010. I've got 4GB version, flashed WX7100_GOP_4GB.ROM, got ventura + windows 10 installation, but has high frequency drops (1200 to 300), it seems to me, that i need to downvolt this a little bit, as far as i understand, the only way to do so, is to use polaris bios editor?
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Hi there, i want to undervolt my RX480 in A1312, can you please tell me, whre i can get info about how to undervolt s7100x? I think steps should be similar?)
As we know from the first post, there is no RX 480 ver: 1.0 that can boot in iMac12,2, unless your RX 480 is Ver: 1.1.
Maybe it is WX7100 4GB Ver: 1.1.
Could you help us to take some pictures of your RX480 that can boot in iMac12,2? It will help some iMac12,2 users to find a working RX480.
Thank you very much
Seems like working power management. The more demand for graphics processing power the higher the frequency - as long as the power consumption limit isn't reached.
That means that the frequency should stay at 300 when sitting idle on the desktop and when you start to move, minimize/maximize or resize windows it should rise; during benchmark runs it should stay at the maximum.
Yesterday i have tested this RX480 again, and thought about GPU VRM throttling, as far, as my GPU temperature stays lover than 80-85 degrees, after 20-30 minutes of gaming card drops frequency of the GPU from 1243 to 300, and memory from 1250 to 300 too. It is impossible to play anything, when every second you got 300 to 1243, and 1243 to 300 again and again..
It is RX480 and it is placed in A1312 2009, 2010, not the 2011 one. 12,2 with GTX 765M.
I suspect the macOS drivers to throttle the card in other situations as well - maybe when the power supply gets hot.
You should compare with running some similar game in Windows in order to know whether the throttling is done by the card itself (VBIOS, board design, ...) or by the graphics drivers.
Maybe then you could find out the reason?
There should be much more graphics cards diagnostic software available for Windows than for macOS.