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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.
miloshov said:
Thanks again,
this is great help. I will try to do this.
Click to expand...

Thank you once more.
i have managed to flash apple rom on to the new gpu.

I used mixed solution,
miloshov said:
Thanks again,
this is great help. I will try to do this.
Click to expand...


Yesterday i managed to successfully flash bios. swapped the cards and it was working right away.
I was so happy and thankful. Use iMac for some time, edited some video, run some benchmarks and at the end
put it on sleep and went to bed as happy man.

In the morning i went to work and didn't use it at all. After i came from work i sat down to do some editing
and iMac wouldn't wake up. I turned it off with power button and restarted it but LCD wouldn't turn on.
I was thinking maybe it is flat cable from LCD, but when i checked it it was not that.

So i started disassembling it again. Took out the GPU and connected it to SOIC8 to check the BIOS.
There i could see that BIOS is empty. Like it erased its self. I flashed the rom once again but again LCD
wouldn't turn on.

Then i took my old GPU and putted it in. Assembled all back and iMac turned on normally like nothing happened.
Checked GPU on AsProgrammer but BIOS was there this time as it should be.

Does anyone have any idea what can this be and can it be fixed?

Thanks in advance
[doublepost=1562175797][/doublepost]
miloshov said:
Thank you once more.
i have managed to flash apple rom on to the new gpu.




Yesterday i managed to successfully flash bios. swapped the cards and it was working right away.
I was so happy and thankful. Use iMac for some time, edited some video, run some benchmarks and at the end
put it on sleep and went to bed as happy man.

In the morning i went to work and didn't use it at all. After i came from work i sat down to do some editing
and iMac wouldn't wake up. I turned it off with power button and restarted it but LCD wouldn't turn on.
I was thinking maybe it is flat cable from LCD, but when i checked it it was not that.

So i started disassembling it again. Took out the GPU and connected it to SOIC8 to check the BIOS.
There i could see that BIOS is empty. Like it erased its self. I flashed the rom once again but again LCD
wouldn't turn on.

Then i took my old GPU and putted it in. Assembled all back and iMac turned on normally like nothing happened.
Checked GPU on AsProgrammer but BIOS was there this time as it should be.

Does anyone have any idea what can this be and can it be fixed?

Is it possible that ROM is bad?
GPU does not look bricked. I have just putted old Alienware ROM back.
So it is flashing normally...
Click to expand...
 
Last edited:
miloshov said:
Thank you once more.
i have managed to flash apple rom on to the new gpu.

I used mixed solution,



Yesterday i managed to successfully flash bios. swapped the cards and it was working right away.
I was so happy and thankful. Use iMac for some time, edited some video, run some benchmarks and at the end
put it on sleep and went to bed as happy man.

In the morning i went to work and didn't use it at all. After i came from work i sat down to do some editing
and iMac wouldn't wake up. I turned it off with power button and restarted it but LCD wouldn't turn on.
I was thinking maybe it is flat cable from LCD, but when i checked it it was not that.

So i started disassembling it again. Took out the GPU and connected it to SOIC8 to check the BIOS.
There i could see that BIOS is empty. Like it erased its self. I flashed the rom once again but again LCD
wouldn't turn on.

Then i took my old GPU and putted it in. Assembled all back and iMac turned on normally like nothing happened.
Checked GPU on AsProgrammer but BIOS was there this time as it should be.

Does anyone have any idea what can this be and can it be fixed?

Thanks in advance
[doublepost=1562175797][/doublepost]


Is it possible that ROM is bad?
GPU does not look bricked. I have just putted old Alienware ROM back.
So it is flashing normally...
Click to expand...

Or maybe that gpu is dead the same way as any other ati card from that era?
 
passatgt said:
Or maybe that gpu is dead the same way as any other ati card from that era?
Click to expand...

i don't know that. How can i be sure?
Mac is turning on with it but lcd is not.
So i hear the theme music and my external hard drive is working so it loads up.

Also on AsProgrammer it is readable...

How is it possible that it died after few hours of use?
it is now logical...
 
miloshov said:
i don't know that. How can i be sure?
Mac is turning on with it but lcd is not.
So i hear the theme music and my external hard drive is working so it loads up.

Also on AsProgrammer it is readable...

How is it possible that it died after few hours of use?
it is now logical...
Click to expand...

Overheating? Have you replaced the thermal pad with adeguate thermal paste?
 
lamerz78 said:
Overheating? Have you replaced the thermal pad with adeguate thermal paste?
Click to expand...

yes of course i did. cannot use old thermal paste...
also if it was overheating it would stop working while it was under load not while it is on sleep?
at least i think so...
 
Actually, the boot screen is not the most important feature for me. It is actually more important for me to get the brightness control working, but I guess, this won't work at all with a PC-GPU.
 
I have something strange. I just got some new SSDs and i installed Sierra on one of those on my MacBookPro. I testet the installation also on my MacPro with GTX680. It is working on both. But on the iMac with K1100M and the other with GTX 765M the screen stays black. What could that be?
 
Hello everyone,

I have a Late 2009 iMac 27" 2374 and I suspect that the GPU ATI 4850 is failing. I've read through a large chunk of this thread and was wondering if anybody has a working 6770m or 6970m they wouldn't mind selling me? I know this isn't a FS section but I figure this may be a good spot to ask. We use the iMac for web browsing and light foto work, nothing crazy or resource intensive.

Fantastic thread though!

Thanks!
 
What about this card ? Looks like it Kepler, but subvendor is MSI

NVIDIA GeForce GTX 860M 2Gb GDDR5
image;s=1000x700.jpeg

image;s=644x461.jpeg
 
Hello! IMac 27 mid-2010 went as a gift. Now it has an ATI Radeon HD 5750 1 GB card installed. Already purchased 6970m (at that time I did not know about this forum). In the process of delivery 770m. There are a couple of questions: 1. How do I understand 6970m at risk with a chip out?
2. Is it necessary to install Mojave to install 770m?
3. 95% I use Windows. Can I make Windows to start default after installing 770m?
Thanks for answers!
 
Last edited:
Now after remove my hdd and install mojave on other mac , i was plug in but nothing bootet... Npram reset nothing is working... On the other imac is that working ... What the f*ck...
 
@AlexPalm i have this card tooo, its working good... But yet i must buy an hd5670 card for install.mojave after by ssd.is crashed :(
 
@Roman78 my old card was broken :( (6870) ... I have remove my new ssd and install on other mac mojave via external ... Then i installed it but my mac wont boot from ssd ... And now i have buy an cheam (5670) gpu card and wait for comming after this i hope i can install and set my nvidia gpu back
 
Hi everyone! I've bought a Dell GTX780m.
Yesterday, I tried install it on my iMac 2010 27 with os 10.10.5 (Yosemite).
It's boot but unfortunately no screen shows.
I've set remove control, it can visited files but can't connect remove screen.
Should I edit the kext file or do something else?
Any suggestion or idea, thanks!
 
win0210 said:
Hi everyone! I've bought a Dell GTX780m.
Yesterday, I tried install it on my iMac 2010 27 with os 10.10.5 (Yosemite).
It's boot but unfortunately no screen shows.
I've set remove control, it can visited files but can't connect remove screen.
Should I edit the kext file or do something else?
Any suggestion or idea, thanks!
Click to expand...

Is it a Dell/Alienware version of the card ?
Maybe you can full post your card info here ?

Could be you need to reseat the gpu in the mxm slot and try again.
The way I used to test it, was by not installing the original screen back, but try a external screen first.
After that install iMac screen.
This is easier testing in my opinion..
One external display output should work..
 
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