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There was a post a couple of months ago that described how to do this. I can't remember who posted it, but you can try using the search tool at the top of the page to maybe find it.

True, I've been searching for the last 5 hours for it. Haven't found one that pertains to this!
 
Look for my guide. it's linked on the first page. Cheers!
thanks. my idea is to flash it as soon as i can use it. As i have read around the 3rd led light off means broken GPU. am i wrong on it? when i changed the gpu before i didn`T have any problem (of course no boot screen nor brightness control but is ok for me). now simply keep the black screen and the fan to run as crazy. plus when use the long heat sink the 2nd light turns off too.... and i can`t explain this behaviour
 
To @Ausdauersportler, @highvoltage12v, @Pascal Baillargeau, @nikey22, @NOTNICE, @herrdude and anyone else who has been a key member of the never-ending modifying, testing, and evaluation of the files, workarounds, and procedures on this thread:
YOU GUYS ARE AWESOME! 👏😃:cool:😃

Thanks to you guys (and some learning and trial and error on my own) I have brought my 27" mid-2011 i7 iMac fully back to life, including installing a 1 TB SSD, the WX7100, and upgrading it to Mojave. Starting out with High Sierra was key to help get through some of the initial stages of understanding the process. And with the most recent version of the Catalina Loader, it only made things easier when I installed the SSD and upgraded to Mojave a couple of days ago. For under $275, I now have a second functional iMac that rivals the performance of my 2017 iMac (and in some cases beats it!).

I just posted updated Valley scores (70.2, 2938) and they are essentially unchanged from what I saw and posted from my results in High Sierra about a month ago. Geekbench Metal score was 43349 (I see there is a column on the spreadsheet for this, but I couldn't find a way to enter it).

I do have one question about the GPU temperature for any others running a WX7100. In Mojave, with MacsFanControl settings for the GPU heatsink of 32 deg and 49 deg, the GPU heatsink temperature during normal daily use is around 45 degrees with the fan running around 2200 rpm. In High Sierra, with the same fan control settings and usage, the temperature was around 40 degrees. Is there any explanation for this difference in temperature? I am not too concerned about it since 45 degrees should be reasonable for my usage (no gaming). I scanned through the thread, but could not find an answer.

Mind linking where you bought the WX7100?
 
I think maybe post #6056 by @herrdude might be what you are after.

EDIT: Ahhh... one minute too late. Thanks @herrdude
Nope! that's not it either. I just want to know how to hide the splash screen that rEFInd has before the screen with the progress bar. Not the one where you select your partitions. I know how to disable that one.
 
Nope! that's not it either. I just want to know how to hide the splash screen that rEFInd has before the screen with the progress bar. Not the one where you select your partitions. I know how to disable that one.
Steps 20-24 hide the OpenCore picker. Let me know if that works.
 
Steps 20-24 hide the OpenCore picker. Let me know if that works.
This is the screen that I'm trying to disable that comes up after you power on the imac.
 

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This is the screen that I'm trying to disable that comes up after you power on the imac.
Are you booting into Windows or MacOS? I haven't seen that screen during any of my experimentation with my iMac booting into MacOS over the last 2 months. I am sure others here that are more skilled than I am might be able to help you out.
 
Are you booting into Windows or MacOS? I haven't seen that screen during any of my experimentation with my iMac booting into MacOS over the last 2 months. I am sure others here that are more skilled than I am might be able to help you out.
I only have mac os installed. I setup everything yesterday with my K1100m gpu. After I was finished I kept seeing that screen.
 
@highvoltage12v

Any other ideas?



I change power supply (Used from ebay) and same issue still.
Remove HDD -> not help

High Sierra still runs fine.. no issues.
 
This is the screen that I'm trying to disable that comes up after you power on the imac.
This happens if you boot into the Catalina Loader twice. After booting the Loader the selection of bootable devices will be shown on screen including the Loader itself. You may change the config.plist and check the hide self checkbox. This is the old Loader, right?
 
@highvoltage12v

Any other ideas?



I change power supply (Used from ebay) and same issue still.
Remove HDD -> not help

High Sierra still runs fine.. no issues.
Have to ask this probably a second time, but did you install the sleep extensions with Mojave or Catalina?
 
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Have to ask this probably a second time,, but did you install the sleep extensions with Mojave or Catalina?

Yes I did.
Now I can't even install Catalina because I get kernel panic to the installer (boot to the installer -> language selection screen -> wait couple minutes and it restart).
Mojave installer work ok, but when it is installed it reboot every 10-15 minutes.
 
To @Ausdauersportler, @highvoltage12v, @Pascal Baillargeau, @nikey22, @NOTNICE, @herrdude and anyone else who has been a key member of the never-ending modifying, testing, and evaluation of the files, workarounds, and procedures on this thread:
YOU GUYS ARE AWESOME! 👏😃:cool:😃.

I just posted updated Valley scores (70.2, 2938) and they are essentially unchanged from what I saw and posted from my results in High Sierra about a month ago. Geekbench Metal score was 43349 (I see there is a column on the spreadsheet for this, but I couldn't find a way to enter it).

I do have one question about the GPU temperature for any others running a WX7100. In Mojave, with MacsFanControl settings for the GPU heatsink of 32 deg and 49 deg, the GPU heatsink temperature during normal daily use is around 45 degrees with the fan running around 2200 rpm. In High Sierra, with the same fan control settings and usage, the temperature was around 40 degrees. Is there any explanation for this difference in temperature? I am not too concerned about it since 45 degrees should be reasonable for my usage (no gaming). I scanned through the thread, but could not find an answer.
We have to ask @NOTNlCE to add a GeekBench5 metal score entry and some more options for cards @nikey22 made BIOS versions for in his form, currently I add this values manually from my cards.

Regarding the temperature it may be caused by the dasct that Mojave and Catalina rely on the metal capabilities unlike High Sierra an draw more power...please use the normal older version of PolarisBoost extension, I changed the config on the new version of the Loader I published back, yesterday.
 
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the problem is that before it worked and i was going to flash the card (k2100), but now that 3rd led didn`t light up at all, and changing the heat sink will even have the 2nd let to turn on, and that is crazy. I don`t have any other gpu with me now cos all the one i have bought (k2100 and k2000) are now having the same issue...led 3 doesn`T turn on. let me try to look for the option you mentioned, but i am worried about the fact that being the 3rd led off the issue is on the gpu (broken?)
The get the third LED only after flashing a correct BIOS from post #1 to the card. If you see only two LED with your not flashed card it has been just recognised in the system and will likely work with limited capabilities (some DELL BIOS versions work in that way).
 
The get the third LED only after flashing a correct BIOS from post #1 to the card. If you see only two LED with your not flashed card it has been just recognised in the system and will likely work with limited capabilities (some DELL BIOS versions work in that way).
thanks for the answer, but it was working and i used the mac before, that is why i was surprised why not working now anymore.....and why changing the heat sink the behaviour is different even with the same gpu....

is there a way to verify if the gpu is damaged?
 
thanks for the answer, but it was working and i used the mac before, that is why i was surprised why not working now anymore.....and why changing the heat sink the behaviour is different even with the same gpu....

is there a way to verify if the gpu is damaged?
Yes, if you get no picture in at least two different iMacs or system you can fence out another hardware problem.
BTW: How to you prove that is something not working??

Changing the heat sink does not change the behaviour, a bad installation on a new heat sink causing a short does!
 
thanks for the answer, but it was working and i used the mac before, that is why i was surprised why not working now anymore.....and why changing the heat sink the behaviour is different even with the same gpu....

is there a way to verify if the gpu is damaged?

The heat sink has shorted a component on the GPU. Get it off and cover all areas of heat sink other than RAM and GPU chip with a thin insulator or, better still, modify the heatsink with a mill/Dremel/file so the short is removed.
 
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pretty exelent job @nikey22

just not being around for a while and a huge progresss, nice.
also want to say, i will get my wx7100m in a few day's the seller said that all card he sold works in Imac.
so X fingers.

report back when i got it and suc6 install, i also report when it don't work haha
 
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The heat sink has shorted a component on the GPU. Get it off and cover all areas of heat sink other than RAM and GPU chip with a thin insulator or, better still, modify the heatsink with a mill/Dremel/file so the short is removed.
thanks guys. How to verify that has shortned a component on the GPU? is there any procedure?
will do all the covering with electric tape than let`s see....so seems need to take another GPU :(
 
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Yes, if you get no picture in at least two different iMacs or system you can fence out another hardware problem.
BTW: How to you prove that is something not working??

Changing the heat sink does not change the behaviour, a bad installation on a new heat sink causing a short does!
thanks, yes i have 2 imacs and same behaviour 2 leds on with the small heatsink, 1 led on with the long heatsink.
How do i prove something is not working? well that is my question ^^ I tried different combinations and the only common pattern i found was with the heatsink. How to check if any short happened is my next question (and i think on the GPU then)
 
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