2011 iMac 27" 6970M solution

[dukefawks]

Both EFI and OS 3S145 report no missing sensors here. I can see there must be an issue with die GPU die sensor, but which diagnostic is finding the fault?

 

[Gurmon]

MRI is reporting these missing sensors.

Im doing another iMac tomorrow, so will take pictures and PM you those.

Do you have AST server setup ?

 

[dukefawks]

So it seems like the SMC is not measuring anything related to the MXM card. No voltage, no current and no temperature. I can only conclude that the system needs to see a supported GPU for it to enable those sensors. Since the DEVID needs to be changed for the 215 chips to work there is nothing I can do about this with regards to the video card. The ODD sensor modification is the best solution at the present moment to at least have some thermal control.

If anyone at Apple wants to "share" the SMC source code I'd be grateful! Without the SMC source this sensor issue is not going to be solved.

 

[Dozer]

No Title

I tryed that, thank you duke for your great work!

in fancontrol there is a GPU diode to see

 

[dukefawks]

Yes fan control sees them but the SMC does not use them as the DEVID of the GPU is wrong.

 

[Dozer]

i tryed that solution already many times. working realy good.

now i get back a not working card.

i looked up the card and the gpu, the side near the pcie contacts, is pressed down until the board. i thought that is a random thing, but now i got back already the 4.! with a pressed down gpu on that side.

what i do wrong? is it possible that the gpu is running that hot ?

 

[dukefawks]

Did you modify the thermal sensor like I showed in the picture?

 

[Dozer]

usually yes.

but this are cards from a shop, they put it in the case themself. can that be the problem?

 

[dukefawks]

Of course that is the problem......do you think I do that modification for fun?

Also stick the sensor to the back of the card on the heat sink next to where the original sensor is, that is the best location. Make sure it can't fall off!!!!

 

[Sykulski]

I’ve used this method with success already many times. But now I got a case where customer is using Windows Bootcamp. After the GPU replacement the computer hangs in boot loader immediately after choosing the Windows partition to boot. A Google search let me know it is because of the edited firmware on the graphics card that causes this issue.

Is there a way to get it to boot into the customers Windows system or do we need to re-install Windows Bootcamp all together?

Thanks

 

[dukefawks]

I do not support bootcamp. In theory it should work and just boot up with the generic VGA driver. I guess bootcamp got fucked up somehow.

 

[Salvatore951]

how can I update rom with this gpu? Can someone explain me procedure, please?

 

[2informaticos]

"You should flash the ROM on an external programmer"

Like any normal BIOS chip. Remove it and plug it into programmer, like TL866, etc...

 

[Salvatore951]

i am using TL866, but it doesn't detect memory model and it reads a blank file. I tried all position, pin with a small circle in the corner should be pin 1. Please can someone explain me how to flash rom with this video card, I have no experience with Gpu rom.