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Issue encountered after iMac 2011 27" upgrade with gtx 780 4gb

jujudjentleman

jujudjentleman

macrumors newbie
Original poster
Jan 13, 2021
27
3
Hey guys !
I upgraded my iMac 2011 with a gtx 780 4gb ( by nick(d)vB )

Everything is working perfectly, but not when I am doing gaming, when I try to play games ( cs go , Minecraft ) the main menu works but not when I am in game, the first screen of the " in game " appear but then immediately my iMac crashes, I tried on Mac OS high Sierra and my bootcamp windows 8,1

I don't think this is an g p u issue since there is no " glitch " thing , and all my video and music production software works fine ( Logic Pro , pro tools , final cut pro )

Can you guys help me ? Thanks !
 
I would try running some graphics benchmarks to see if your GPU is really active and ok. Assuming you have a 27” machine, since installing that GPU in a 21.5” Mac is problematic.
 
The benchmarks is abnormally bad , and yes it’s a 27"

does this mean that the GPU is defective ( f****** eBay seller ) or it can be another thing ?
 
You should probably go back and reread the wikipost on the gpu replacement. I saw this under hardware problems:

20. bad Valley performance compared to published results: a single missing temp sensor will deny the CPU boosting . Valley depends to 50% on the CPU. So you will only see max values with a properly boosting CPU. Check all cables, probably do a SMC reset (how to: section other 4. below) and a cold start.

Also did you use replace the heat sink on the GPU with the 3-pipe version? That seems to be necessary since the 780m runs hotter.
 
Chris2020 said:
You should probably go back and reread the wikipost on the gpu replacement. I saw this under hardware problems:

20. bad Valley performance compared to published results: a single missing temp sensor will deny the CPU boosting . Valley depends to 50% on the CPU. So you will only see max values with a properly boosting CPU. Check all cables, probably do a SMC reset (how to: section other 4. below) and a cold start.

Also did you use replace the heat sink on the GPU with the 3-pipe version? That seems to be necessary since the 780m runs hotter.
Click to expand...
All I just did while for the upgrade of my iMac 2011 was plug & play the new gtx 780 ( with the new vBios ) after puts some k4-pro and k5-pro thermal paste in it , I also set correctly the fan controls . Then... th

did I missed something ? What is valley ?
 
Tried SMC/NVRAM/PRAM reset and the problem is still here , everything is working fine , Logic Pro works flawlessly .
But then when i load League Of Legends , the main menu and loading screen are fine , but when the game start , the 2/3 first frame of the game are showed then it immediately crash , I have high Sierra but the same thing happen with my Windows 10 bootcamp...
Also the benchmark program are crashing when they are testing the GPU

I have litteraly no solution left haha
If there is litteraly nothing I can do I will only use this computer for producing stuff and buy another computer for playing Minecraft
 
I wonder if you are missing some software patch that lets the card run correctly. Maybe install High Sierra again? Maybe even try booting through OpenCore to see if that helps. I don't really have any better ideas for you.
 
jujudjentleman said:
Tried SMC/NVRAM/PRAM reset and the problem is still here , everything is working fine , Logic Pro works flawlessly .
But then when i load League Of Legends , the main menu and loading screen are fine , but when the game start , the 2/3 first frame of the game are showed then it immediately crash , I have high Sierra but the same thing happen with my Windows 10 bootcamp...
Also the benchmark program are crashing when they are testing the GPU

I have litteraly no solution left haha
If there is litteraly nothing I can do I will only use this computer for producing stuff and buy another computer for playing Minecraft
Click to expand...

Clearly the signs of an overheating GPU.
Or when the GPU is heated up, some parts on the MXM card caused short-circuit and shutdown the entire machine.
 
Chris2020 said:
See if this could help you:
forums.macrumors.com

2011 iMac Graphics Card Upgrade

Sierra and High Sierra Package Installer ( iMac 2009-2011 AGC, FakeSCM, Lilu, WhateverGreen, AppleBacklightFixup installer) Attached you will find the a kernel extension package installer currently working on Sierra 10.12 and later. SIP needs to be disabled. Boot into recovery, start Terminal...
forums.macrumors.com forums.macrumors.com
Click to expand...
I tried this , and still crashes when i start playing after loading time ( league of legends )
 
The GPU is clearly not heating extremely since the macs fan control are set correctly , it’s much colder than the previous AMD 6XXX series, but again when the previous AMD was defective it was crashing when gaming but also when I was doing intensive Logic Pro task .. the Nvidia crash while gaming , it don’t make any sense haha
 
If the issue is only gaming, then the best solution will be stop gaming on your iMac.
But as you said, benchmarking programs also crashed.

So I assume the issue is the contact between the GPU chip and the heatsink.
Use some temperature monitoring apps to see if there are any abnormalities in the temperature readings, if there are, maybe you should reassemble the MXM card.
Too thick thermal pad/paste applied on the VRAM chips may cause the GPU chip making bad contact with the heatsink.
That's why others advice to use the copper shims between the GPU chip and the heatsink.
 
Last edited:
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Nguyen Duc Hieu said:
If the issue is only gaming, then the best solution will be stop gaming on your iMac.
But as you said, benchmarking programs also crashed.

So I assume the issue is the contact between the GPU chip and the heatsink.
Use some temperature monitoring apps to see if there are any abnormalities in the temperature readings, if there are, maybe you should reassemble the MXM card.
Too thick thermal pad/paste applied on the VRAM chips may cause the GPU chip making bad contact with the heatsink.
That's why others advice to use the copper shims between the GPU chip and the heatsink.
Click to expand...
when I plugged the GPU I put a looot of thermal paste , isn’t it suppose to be a good thing ? If one day I will open the iMac again I will check this up, but for the moment i will stay like this ( bye gaming ! )
 
jujudjentleman said:
when I plugged the GPU I put a looot of thermal paste , isn’t it suppose to be a good thing ? If one day I will open the iMac again I will check this up, but for the moment i will stay like this ( bye gaming ! )
Click to expand...

It is supposed to be a bad practice. The surfaces of GPU die and heatsink are supposed to make contact, with some pressure. Thermal paste is supposed to fill in the tiny scratches on both surfaces. If you have like 0.1mm gap between them and try to fill that gap with thermal paste, then heat dispassion will not be good enough for heavy GPU strain.
 
Ok i am back , since the GPU seems to also crash when I am running Logic Pro , I runs Mac fan controls and.. SURPRISE the GPU sensor don’t show the temperature ... so I think it’s a bad thermal paste use.... Can you guys show me a right picture on a good thermal paste use in a picture ??
And also , is there any mods to do for the heat sink when I set the gtx 780 into it ?
 
Here is the picture of the fans control
 

Attachments

  • 5B254702-1610-479B-B72D-A0A6E8B8471E.jpeg
    5B254702-1610-479B-B72D-A0A6E8B8471E.jpeg
    1.1 MB · Views: 156
It is my understanding that iMac cannot read the temperature sensor in the GPU with the new bios. Also I see in the original thread that you need the 3 pipe heat sink but that should already be in the 2011 iMac 27". I don't think that you need to modify the heat sink. But if you go back to that original thread there is some discussion on moving the ODD temp sensor to the GPU heat sink and use that to control the ODD fan.

Other than that, I see that you should have the gtx 780M card and not gtx 780.
 
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Chris2020 said:
It is my understanding that iMac cannot read the temperature sensor in the GPU with the new bios. Also I see in the original thread that you need the 3 pipe heat sink but that should already be in the 2011 iMac 27". I don't think that you need to modify the heat sink. But if you go back to that original thread there is some discussion on moving the ODD temp sensor to the GPU heat sink and use that to control the ODD fan.

Other than that, I see that you should have the gtx 780M card and not gtx 780.
Click to expand...
So if I am referring to you all my temperature sensor on the screenshot seems fine , and yes I have the gtx 780m does it makes a difference in the problem ??
 
Since the iMac can't read the temperature sensor in the GPU (embedded in the chip) then we can't be sure of the actual GPU chip temperature. We just have the sensor on the heat sink. But if the GPU chip is not making good contact with the heat sink, then the GPU chip could be too hot although the heat sink looks ok. Maybe you can look into the copper shims that Nguyen mentioned.
 
Anonymous UUID: 92AD1BC9-E0D6-C3D2-CCB4-748A372F0C8D

Wed Jan 20 20:06:40 2021

*** Panic Report ***
panic(cpu 0 caller 0xffffff800fb887df): Kernel trap at 0xffffff7f91f34966, type 14=page fault, registers:
CR0: 0x000000008001003b, CR2: 0xffffff83b774ea8c, CR3: 0x00000000135ef000, CR4: 0x00000000000626e0
RAX: 0xffffff83b774ea00, RBX: 0xffffff804e4fd800, RCX: 0x0000000000000003, RDX: 0xffffffa3d7021000
RSP: 0xffffff83a5753ad0, RBP: 0xffffff83a5753ad0, RSI: 0xffffff804e4fe680, RDI: 0xffffff804e4fd800
R8: 0x0000000000000000, R9: 0x0000000000000001, R10: 0x0000000000000000, R11: 0x0000000000000000
R12: 0xffffff804d689000, R13: 0xffffff8067b31c00, R14: 0x0000000000000000, R15: 0x0000000000003721
RFL: 0x0000000000010282, RIP: 0xffffff7f91f34966, CS: 0x0000000000000008, SS: 0x0000000000000000
Fault CR2: 0xffffff83b774ea8c, Error code: 0x0000000000000002, Fault CPU: 0x0, PL: 0, VF: 1

Backtrace (CPU 0), Frame : Return Address
0xffffff83a57535a0 : 0xffffff800fa6ce56
0xffffff83a57535f0 : 0xffffff800fb963e4
0xffffff83a5753630 : 0xffffff800fb885b4
0xffffff83a57536a0 : 0xffffff800fa1ee60
0xffffff83a57536c0 : 0xffffff800fa6c8cc
0xffffff83a57537f0 : 0xffffff800fa6c68c
0xffffff83a5753850 : 0xffffff800fb887df
0xffffff83a57539c0 : 0xffffff800fa1ee60
0xffffff83a57539e0 : 0xffffff7f91f34966
0xffffff83a5753ad0 : 0xffffff7f91f32757
0xffffff83a5753b00 : 0xffffff7f91f558d1
0xffffff83a5753bc0 : 0xffffff7f91f55331
0xffffff83a5753bf0 : 0xffffff7f91e66dc9
0xffffff83a5753c80 : 0xffffff7f91e662f6
0xffffff83a5753ca0 : 0xffffff7f91e91dc7
0xffffff83a5753ce0 : 0xffffff7f91f5d514
0xffffff83a5753d00 : 0xffffff7f91f2f3a2
0xffffff83a5753d30 : 0xffffff7f91f2ee3c
0xffffff83a5753d50 : 0xffffff7f91f0bf1f
0xffffff83a5753d80 : 0xffffff7f91f4ba01
0xffffff83a5753db0 : 0xffffff7f91f4b90e
0xffffff83a5753de0 : 0xffffff7f91f0e270
0xffffff83a5753e10 : 0xffffff7f91e8262d
0xffffff83a5753e30 : 0xffffff7f91e826ba
0xffffff83a5753e60 : 0xffffff80100705c2
0xffffff83a5753ea0 : 0xffffff80100982fe
0xffffff83a5753ee0 : 0xffffff801006f6f8
0xffffff83a5753f60 : 0xffffff8010079437
0xffffff83a5753fa0 : 0xffffff800fa1e557
Kernel Extensions in backtrace:
com.apple.iokit.IOAcceleratorFamily2(378.28)[D342FE41-0457-3586-ABB0-38E8E3947C4F]@0xffffff7f91e4e000->0xffffff7f91ee6fff
dependency: com.apple.driver.AppleMobileFileIntegrity(1.0.5)[1F788291-6344-37F1-802C-7E74F8822B4B]@0xffffff7f9073d000
dependency: com.apple.iokit.IOSurface(211.15)[37BCC686-AF99-3381-AC4F-E54A347E0F40]@0xffffff7f915bc000
dependency: com.apple.iokit.IOPCIFamily(2.9)[5A070389-F327-3542-96C3-D2E795B4FE0A]@0xffffff7f90294000
dependency: com.apple.iokit.IOGraphicsFamily(519.23)[81D774E8-DD11-3866-B90A-E855215EDB60]@0xffffff7f907de000
com.apple.GeForce(10.3.2)[82A4016E-4E37-3565-ACEE-A2A81D5D4C8E]@0xffffff7f91ef7000->0xffffff7f91f92fff
dependency: com.apple.iokit.IOPCIFamily(2.9)[5A070389-F327-3542-96C3-D2E795B4FE0A]@0xffffff7f90294000
dependency: com.apple.iokit.IONDRVSupport(519.21)[B9EB0174-55E4-3CB1-9802-E74BB1BD5EF0]@0xffffff7f90834000
dependency: com.apple.nvidia.driver.NVDAResman(10.3.2)[6DE4BC26-EEC1-379B-AD41-532FB0A529CD]@0xffffff7f90850000
dependency: com.apple.iokit.IOGraphicsFamily(519.23)[81D774E8-DD11-3866-B90A-E855215EDB60]@0xffffff7f907de000
dependency: com.apple.iokit.IOAcceleratorFamily2(378.28)[D342FE41-0457-3586-ABB0-38E8E3947C4F]@0xffffff7f91e4e000

BSD process name corresponding to current thread: kernel_task

Mac OS version:
17G11023

Kernel version:
Darwin Kernel Version 17.7.0: Thu Jan 23 07:05:23 PST 2020; root:xnu-4570.71.69~1/RELEASE_X86_64
Kernel UUID: D8347098-9B31-3C8E-A1C9-CA857F05BB97
Kernel slide: 0x000000000f800000
Kernel text base: 0xffffff800fa00000
__HIB text base: 0xffffff800f900000
System model name: iMac12,2 (Mac-942B59F58194171B)

System uptime in nanoseconds: 1710111700410
last loaded kext at 287977476600: com.apple.filesystems.msdosfs 1.10 (addr 0xffffff7f92d1d000, size 69632)
last unloaded kext at 1329400094106: com.apple.driver.AppleUSBAudio 312.6 (addr 0xffffff7f92198000, size 397312)
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com.apple.nvidia.driver.NVDAResman 10.3.2
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EOF
Model: iMac12,2, BootROM 87.0.0.0.0, 4 processors, Intel Core i7, 3,4 GHz, 32 GB, SMC 1.72f2
Graphics: GeForce GTX 780M by Nick[D]vB, GeForce GTX 780M by Nick[D]vB, PCIe
Memory Module: BANK 0/DIMM0, 8 GB, DDR3, 1333 MHz, 0x0000, 0x202020202020202020202020202020202020
Memory Module: BANK 1/DIMM0, 8 GB, DDR3, 1333 MHz, 0x0000, 0x202020202020202020202020202020202020
Memory Module: BANK 0/DIMM1, 8 GB, DDR3, 1333 MHz, 0x0000, 0x202020202020202020202020202020202020
Memory Module: BANK 1/DIMM1, 8 GB, DDR3, 1333 MHz, 0x80AD, 0x484D5434314753364D465238432D48392020
AirPort: spairport_wireless_card_type_airport_extreme (0x168C, 0x9A), Atheros 9380: 4.0.74.0-P2P
Bluetooth: Version 6.0.7f17, 3 services, 27 devices, 1 incoming serial ports
Network Service: Wi-Fi, AirPort, en1
Serial ATA Device: Hitachi HDS722020ALA330, 2 TB
Serial ATA Device: OPTIARC DVD RW AD-5690H
USB Device: USB 2.0 Bus
USB Device: FaceTime HD Camera (Built-in)
USB Device: Hub
USB Device: BRCM2046 Hub
USB Device: Bluetooth USB Host Controller
USB Device: USB 2.0 Bus
USB Device: Hub
USB Device: Keyboard Hub
USB Device: Apple Keyboard
USB Device: IR Receiver
USB Device: Internal Memory Card Reader
Thunderbolt Bus: iMac, Apple Inc., 22.1


This is the error message I get, I can't translate this message but I though that I can maybe help to write it here
 
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