5,1 cpu tray in 4,1 MP. Fans won't stop?

[InuNacho]

I just swapped the CPU tray in my 4,1 with a 5,1 and now the fans are running at full blast non-stop. I've done the 4,1 -> 5,1 upgrade so and I figured thats all I'd need but apparently I need a bit more assistance in my upgrade.
How can I go about turning the fans down? I've noticed that the Mac Pro fan control does nothing.

 

[tsialex]

I just swapped the CPU tray in my 4,1 with a 5,1 and now the fans are running at full blast non-stop. I've done the 4,1 -> 5,1 upgrade so and I figured thats all I'd need but apparently I need a bit more assistance in my upgrade.
How can I go about turning the fans down? I've noticed that the Mac Pro fan control does nothing.

it's a know issue, 2009 and 2010/12 trays are not interchangeable, SMC mismatch version. Since SMC from the tray can't talk to SMC from the logic board, no Fan control app works.

No one knows how to update the SMC on 4,1 tray/logic board (1.39f5) to the same on a real 5,1 Mac Pro (1.39f11).

You have to exchange for a real 2009 tray or change your logic board to a real 2010/12 version.

 

[flowrider]

As said, it's a known issue. Do a search and you'll find many threads on this.

However, It's my understanding with the utility Macs Fan Control (https://www.crystalidea.com/macs-fan-control) you will be able to manually control the fans.

https://forums.macrumors.com/threads/mac-pro-5-1-upgrade-smc-conflict-fan-control.2062360/

Lou

 

[InuNacho]

Ah bummer, I got a pretty decent deal on a complete hex 3.46 5,1 board and thought it'd work without any actual research. Guess now I'll just take out the CPU, delid, and put it in my old 4,1 tray.
Thanks for the help anyways fellas.

 

[handheldgames]

Ah bummer, I got a pretty decent deal on a complete hex 3.46 5,1 board and thought it'd work without any actual research. Guess now I'll just take out the CPU, delid, and put it in my old 4,1 tray.
Thanks for the help anyways fellas.

a 5,1 logic board is about 125 on ebay.

 

[tsialex]

Ah bummer, I got a pretty decent deal on a complete hex 3.46 5,1 board and thought it'd work without any actual research. Guess now I'll just take out the CPU, delid, and put it in my old 4,1 tray.
Thanks for the help anyways fellas.

You only need to delid for 2009 dual processors trays, btw.

 

[h9826790]

As said, it's a known issue. Do a search and you'll find many threads on this.

However, It's my understanding with the utility Macs Fan Control (https://www.crystalidea.com/macs-fan-control) you will be able to manually control the fans.

https://forums.macrumors.com/threads/mac-pro-5-1-upgrade-smc-conflict-fan-control.2062360/

Lou

No, cannot.

MacsFanControl control the fans by setting the associated SMC key. When the SMC mismatch, MacsFanControl doesn’t work.

It’s more powerful then most of other fan control software just because it set the target fan speed SMC key, but not the minimum fan speed SMC key. This will completely override the system protection, allow the user set lower fan speed than the system commanded.

However, this approach won’t work when the whole SMC stop working.

 

[InuNacho]

a 5,1 logic board is about 125 on ebay.

Is there any need to put in the logic board? The big sticked thread seems to indicate that I can drop in the hex without swapping the entire logic board.

 

[tsialex]

Is there any need to put in the logic board? The big sticked thread seems to indicate that I can drop in the hex without swapping the entire logic board.

On a single CPU tray:
- unmount the heatsinks from the trays
- clean the new processor removing old thermal paste from it and the heatsink
- swap processors
- apply new thermal paste to the processor
- remount the heatsink
- install the tray on the Mac Pro

No delid needed.

 

[flowrider]

No, cannot.

Sorry, My Bad

Lou

 

[parrotgeek1]

it's a know issue, 2009 and 2010/12 trays are not interchangeable, SMC mismatch version. Since SMC from the tray can't talk to SMC from the logic board, no Fan control app works.

No one knows how to update the SMC on 4,1 tray/logic board (1.39f5) to the same on a real 5,1 Mac Pro (1.39f11).

You have to exchange for a real 2009 tray or change your logic board to a real 2010/12 version.

If only someone could dump SMC firmware from the logic board I would be able to make an update

 

[tsialex]

If only someone could dump SMC firmware from the logic board I would be able to make an update

How to dump it, @parrotgeek1? Since macmini1,1/2,1 days I want to do that. I'd like to know what chip stores the SMC too.

 

[parrotgeek1]

How to dump it, @parrotgeek1? Since macmini1,1/2,1 days I want to do that. I'd like to know what chip stores the SMC too.

I have no idea...

 

[minifridge1138]

A single cpu tray from a 4,1 uses lidded processors.
If your 5,1 tray has lidded processors, then you don't need to delid them.
If your 5,1 tray has de-lidded processors, then there is no way I know of to put them in the 4,1 tray.

 

[HaypurTiryading]

If only someone could dump SMC firmware from the logic board I would be able to make an update

@dosdude1

 

[spidertnt]

I just successfully swapped the SMC chip and bios from a 5.1 logic board to a 4.1 . It seems to work fine ...fans are now operating at normal speed .

 

[adam9c1]

How did you do it?

 

[h9826790]

How did you do it?

Desolder + Solder?

 

[spidertnt]

Desolder + Solder?

Desolder both from dead 5.1 board and re-solder on 4.1

Just ran apple diagnostics on it ...passed !

 

[InuNacho]

Neat and congrats on getting it to work.

 

[leon771]

I just successfully swapped the SMC chip and bios from a 5.1 logic board to a 4.1 . It seems to work fine ...fans are now operating at normal speed .

First time I’ve heard of this occurring.
Well done.

 

[parisinvest]

First time I’ve heard of this occurring.
Well done.

as i know the 4,1 and 5,1 are the same chipset same configuration same power, only smc are different, and yes you can downgrade and upgrade the logic board, once you have the same smc between the mortherboard and cpu tray, the fans will run normally.

 

[luisfromamora]

I could swap the SMC from a donor single CPU 5,1 board to a 4,1 dual CPU board. Would this work? Probably a different SMC/firmware, no?!

 

[tsialex]

I could swap the SMC from a donor single CPU 5,1 board to a 4,1 dual CPU board. Would this work? Probably a different SMC/firmware, no?!

No, you have to swap the backplanes SMCs, not the CPU tray SMC micro-controller. Besides the SMC firmware version inside the micro-controller, backplanes are identical between 2009 and 2010/2012, while CPU trays have several differences.

 

[h9826790]

I could swap the SMC from a donor single CPU 5,1 board to a 4,1 dual CPU board. Would this work? Probably a different SMC/firmware, no?!

If you want to use genuine 5,1 tray with 4,1 (flashed to 5,1) logic board (as per the OP's situation)

You can either

1) Solder a 4,1 SMC chip on to the 5,1 tray. Therefore, you can have a dual processor tray that can use normal lidded CPU, with 4,1 SMC on it.

2) Solder a 5,1 SMC chip on to the 4,1 logic board. Therefore, you now practically make your cMP identical as genuine 5,1. Able to use 2010-2012 tray (but cannot use 2009 tray anymore).