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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.
Hello everyone.
I got iMac 2011 with 880m flashed by Nikey22's rom started and working good. But after restart I got boot-chime-boot-chime error. It helps if I change original 6770 radeon card and start osx, then change to 880m.
Could anyone help me step by step? What if I forgot to install kexts or something?
 
greensour said:
Hello everyone.
I got iMac 2011 with 880m flashed by Nikey22's rom started and working good. But after restart I got boot-chime-boot-chime error. It helps if I change original 6770 radeon card and start osx, then change to 880m.
Could anyone help me step by step? What if I forgot to install kexts or something?
Click to expand...
I had this once with a K4100M (which is perfectly fine and runs in another 2011, now). My solutions was to change back to the old or another graphics card, to reset the PRAM, to do a SMC reset and to install back the K4100M and to keep fingers crossed while switching on the machine. Sorry, but I never found out the reason for this weird behavior. Probably one should to the PRAM reset in any case before changing hardware.

Finally: You cannot patch hardware problems away. And you already knew that there is no way out than disassembling the machine. Please do this before posting. Nobody can make a boot-chime-loop go away by hand waving.

Which heat sink do you use right now with the 880M?
 
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Ausdauersportler said:
I had this once with a K4100M (which is perfectly fine and runs in another 2011, now). My solutions was to change back to the old or another graphics card, to reset the PRAM, to do a SMC reset and to install back the K4100M and to keep fingers crossed while switching on the machine. Sorry, but I never found out the reason for this weird behavior. Probably one should to the PRAM reset in any case before changing hardware.

Finally: You cannot patch hardware problems away. And you already knew that there is no way out than disassembling the machine. Please do this before posting. Nobody can make a boot-chime-loop go away by hand waving.

Which heat sink do you use right now with the 880M?
Click to expand...
I really hope this is a 3 pipes version
 
Ausdauersportler said:
I had this once with a K4100M (which is perfectly fine and runs in another 2011, now). My solutions was to change back to the old or another graphics card, to reset the PRAM, to do a SMC reset and to install back the K4100M and to keep fingers crossed while switching on the machine. Sorry, but I never found out the reason for this weird behavior. Probably one should to the PRAM reset in any case before changing hardware.

Finally: You cannot patch hardware problems away. And you already knew that there is no way out than disassembling the machine. Please do this before posting. Nobody can make a boot-chime-loop go away by hand waving.

Which heat sink do you use right now with the 880M?
Click to expand...

I got 3 pipe heatsink. Also I did pram reset and smc too. It always work after changing original gpu back and works good! But after restart (not always!) it has boot-chime stuck problem. Sometimes it needs to 3-4 time pram reset, sometimes it won't work. Also I don't install any kexts maybe it is the problem? Also I did fresh install with dosdude installer to new ssd with 880m installed.
 
greensour said:
I got 3 pipe heatsink. Also I did pram reset and smc too. It always work after changing original gpu back and works good! But after restart (not always!) it has boot-chime stuck problem. Sometimes it needs to 3-4 time pram reset, sometimes it won't work. Also I don't install any kexts maybe it is the problem? Also I did fresh install with dosdude installer to new ssd with 880m installed.
Click to expand...
Again, read post #1 and follow the imac 2011 installation instructions for the OS version you are using.
 
Ausdauersportler said:
Run Unigine Valley on your Linux installation and compare the results with the published ones on post #1. This may be a better load test.
Bad memory is the next possible answer. You have a lot of possible tests to do and only you can do this.
Click to expand...

Tried a Unigine test, got the scores and they seem to be a bit lower 5-10% than those in the spreadsheet linked in the first post, however I probably equate this to Linux running as a live boot on a USB2.0 more than anything else..
 
ACwDC said:
Try replacing the battery on the logicboard (CR2032). I had a similar issue.
ACwDC
Click to expand...
i don't think that battery problem. i try remove the battery before but the board still dead. but I haven't tried to replace the battery, i'll try thanks for the advice
 
ZenSurfeur said:
it could be :)
Click to expand...

Update.
Clean install of macOS Catalina
Installed all the correct kexts and enabled QuickSync as first page says

Valley score is still 1740 - 1800 range.

Not sure why that is compared to two other scores listed in the spreadsheet for the k5100m
After thought... could RAM be the reason?
Currently running 24gb ram
 
Last edited:
Hello everyone and my next respect Nick [D] vB. I have strange behavior of the video card (770m is stitched with the latest Nick [D] vB firmware). At maximum load, the video processor frequency drops to 770.8 MHz. The core temperature does not exceed 80 degrees Celsius. After 3-4 minutes the video processor goes into throttling - the frequency drops to 400 MHz, recovers to 770.8 and again to 400. The temperature is kept within 75-78 degrees (I have a heatsink with two pipes). What could it be?

I have attached a log file, but it is not throttled. For some reason, the second time does not go into throttling.
 

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Last edited:
Zulus555 said:
Hello everyone and my next respect Nick [D] vB. I have strange behavior of the video card (770m is stitched with the latest Nick [D] vB firmware). At maximum load, the video processor frequency drops to 770.8 MHz. The core temperature does not exceed 80 degrees Celsius. After 3-4 minutes the video processor goes into throttling - the frequency drops to 400 MHz, recovers to 770.8 and again to 400. The temperature is kept within 75-78 degrees (I have a heatsink with two pipes). What could it be?

I have attached a log file, but it is not throttled. For some reason, the second time does not go into throttling.
Click to expand...
Install and configure Macs Fan Control to avoid temperatures over 70 C. You may have faced just the temperature related down clocking of the GPU and you ignored the advice to use the 3pipe heat sink to avoid exactly such a scenario.
The behavior is not really strange...
 
earmstr18 said:
Update.
Clean install of macOS Catalina
Installed all the correct kexts and enabled QuickSync as first page says

Valley score is still 1740 - 1800 range.

Not sure why that is compared to two other scores listed in the spreadsheet for the k5100m
After thought... could RAM be the reason?
Currently running 24gb ram
Click to expand...
Make sure your Valley settings are set to:
- "Resolution" "1920x1080"
- "Quality" "Medium"
- "Anti-Aliasing" "Off"
- "Stereo 3D" "Disabled"
- "Full Screen" not activated (that's what I use to have it set to; don't know whether that matters)
 
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internetzel said:
Make sure your Valley settings are set to:
- "Resolution" "1920x1080"
- "Quality" "Medium"
- "Anti-Aliasing" "Off"
- "Stereo 3D" "Disabled"
- "Full Screen" not activated (that's what I use to have it set to; don't know whether that matters)
Click to expand...

yes, those are all set.
 
earmstr18 said:
Update.
Clean install of macOS Catalina
Installed all the correct kexts and enabled QuickSync as first page says

Valley score is still 1740 - 1800 range.

Not sure why that is compared to two other scores listed in the spreadsheet for the k5100m
After thought... could RAM be the reason?
Currently running 24gb ram
Click to expand...
how do you ram are installed?
make a screenshot of your memory installation like this
Capture d’écran 2020-09-11 à 14.05.00.png
 
Ausdauersportler said:
Install and configure Macs Fan Control to avoid temperatures over 70 C. You may have faced just the temperature related down clocking of the GPU and you ignored the advice to use the 3pipe heat sink to avoid exactly such a scenario.
The behavior is not really strange...
Click to expand...

Macs Fan Control installed. At maximum fan speed under load, the temperature is 75 degrees. Apparently a radiator with three pipes is needed.
 
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