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Bought a CPU tray - fans at full speed

adam9c1

adam9c1

macrumors 68000
Original poster
May 2, 2012
1,898
315
Chicagoland
I have a 4,1 flashed to 5,1 and all is fine.

Purchased a spare single socket CPU tray and fans go at full speed at power up.

Here is the info:
Boot ROM Version: MP51.0084.B00
SMC Version (system): 1.39f5
SMC Version (processor tray): 1.39f11

Do I have a bad CPU tray? or do I need to flash the firmware back to 4,1 and then again to 5,1 with THIS tray?

Did SMC and NVRAM reset.
Installed fan control and it does not make a difference.

Installed TGPro (which I'm familiar with) and on this machine is in trial mode so I can't read exactly the CPU diode, CPU heatsink, and Cothe northbridge temp is similar to my 5,1
 
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if the tray is from a genuine 5,1 it will never work properly with your 4,1 -> 5,1 flashed mainboard.

the SMC and processor tray versions have to be the same.

Here's a whole thread on the exact same problem.
 
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adam9c1 said:
The tray is a 2009

it says
Apple C 2009
820-2482-A
Click to expand...

Speculating here, but if that's a copyright 2009 logo, it would be because the actual hardware of the 2010 single processor tray is identical AFAIK to the 2009 (as opposed to the dual processor which is different for 2009/2010), but the SMC firmware is different for the 2010-12 model, which makes it a different part as far as the machine is concerned.
 
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I think I’m beginning to understand this...

The processor on the board is QC 2.8 (not offered in 2009). If this CPU is factory then this would be a 2010 board.

I have a 2010 5,1 I’ll test this in (but I really wanted a 2009 board to use in a 2009 4,1 flashed to 5,1).
 
5,1 trays should stay with 5,1 machines. 4,1 trays should stay with 4,1 machines.

The most confusing part is when machines are upgraded 4,1 > 5,1 and the trays are being sold as 5,1 parts or a barebones 5,1 machine. Not all these are listed or disclosed properly. They should be fine for a 4,1 machine but will (likely) be a problem with authentic 5,1 machines.

Authentic 5,1 dual CPU trays are harder to find than 4,1 trays on eBay.
 
adam9c1 said:
I think I’m beginning to understand this...

The processor on the board is QC 2.8 (not offered in 2009). If this CPU is factory then this would be a 2010 board.

I have a 2010 5,1 I’ll test this in (but I really wanted a 2009 board to use in a 2009 4,1 flashed to 5,1).
Click to expand...

820-2482 is the 5,1 CPU tray model number, and interchangeable with 661-5707.

The 4,1 single processor tray model number should be 661-4999.

The 820-2482-A may be a replacement parts for 5,1. But Apple also use this parts to fix 4,1 when the 661-4999 isn't available anymore, however, I believe Apple gave special treatment to downgrade the SMC firmware before they install this parts into a 4,1.

I am now actually using a 820-2482-A processor tray. It doesn't look identical to my original processor board. The original one is "matte", but this 820-2482-A is partly "glossy". I got this tray directly from Apple back in Jul 2015. The Apple store staff said they need about 2 weeks to order this parts. The receipts show the part number is 661-4999, however, the number printed on the processor board is 820-2482-A.

Update 1: Just did some research, it seems 820-2482-A is the correct "manufacture part number" for the 661-4999 (Apple part number). So, really don't know what's wrong on your tray. You see that

Apple ⓒ 2009
820-2482-A

on the processor board, is that correct?
 
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I put that same board into a 2010 5,1 and it’s nice and quiet.

That 2010’s original board has the exact same markings (2009).

Also I got the serial number from the tower the board came out of and it shows a 2011 manufactured 2010 model.

Weird!
 
adam9c1 said:
I put that same board into a 2010 5,1 and it’s nice and quiet.

That 2010’s original board has the exact same markings (2009).

Also I got the serial number from the tower the board came out of and it shows a 2011 manufactured 2010 model.

Weird!
Click to expand...

The board markings will be the same, because it’s the same part (the 2009 might be a copyright year) just with a different firmware. As I mentioned previously, the dual processor models have a different physical design from 2009 to 2010, the former having less heat sink clearance due to the use of delidded processors, but the single processor versions were always using standard lidded cpus.

The 2010 was manufactured until 2012, then the final cheesgrater revision was released, to some mockery as being just a minor spec bump, rather than deserving a new model moniker.
 
Macschrauber said:
Try with macs fan control or alike to set up fan speeds
Click to expand...

It won’t work. From his post, obviously the SMC doesnt match. In this case, it’s impossble for any software to control the fan because no firmware support. The “link” between the software and the physical fan is missing.

Fan control softwares control the fan by altering the value of SMC keys. If SMC doesn’t work, none of those SMC key can work.
 
adam9c1 said:
So is there a way to physically ID 4,1 vs 5,1 single socket tray?
Click to expand...

In case this is at all helpful, attached is a photo that was just taken from an authentic 5,1 mid-2012 Mac Pro with single processor. CPU board was pulled this morning to replace with a dual-processor board. You can see the part number 820-2482-A and (C) 2009. This particular machine was purchased in May 2013.

This is the B&H link to the listing: https://www.bhphotovideo.com/c/product/872718-REG/Apple_Z0P1_MD7701_Mac_Pro_6_Core_Desktop.html

MacPro5_1_CPU.jpg
 
bsbeamer said:
In case this is at all helpful, attached is a photo that was just taken from an authentic 5,1 mid-2012 Mac Pro with single processor. CPU board was pulled this morning to replace with a dual-processor board. You can see the part number 820-2482-A and (C) 2009. This particular machine was purchased in May 2013.

This is the B&H link to the listing: https://www.bhphotovideo.com/c/product/872718-REG/Apple_Z0P1_MD7701_Mac_Pro_6_Core_Desktop.html

View attachment 753946
Click to expand...

My Early 2009 Mac Pro has this identical printing on the CPU tray (a replacement part from Apple in Jul 2015). I really doubt if it’s possible to know a tray is for 4,1 by its appearance now.
 
The dual CPU tray on the 2009 uses lidless processors and the 2010/2012 uses lidded processors. Even if the PCB is the same, shouldn't there be a noticeable physical difference for the CPU clamping hardware?
 
ActionableMango said:
The dual CPU tray on the 2009 uses lidless processors and the 2010/2012 uses lidded processors. Even if the PCB is the same, shouldn't there be a noticeable physical difference for the CPU clamping hardware?
Click to expand...

That is correct. The issue does not come apparent when one is purchasing a 2nd hand/used tray. Without "opening it up" one will not know.
 
ActionableMango said:
The dual CPU tray on the 2009 uses lidless processors and the 2010/2012 uses lidded processors. Even if the PCB is the same, shouldn't there be a noticeable physical difference for the CPU clamping hardware?
Click to expand...

But this thread is about single processor tray. So, I really don't know how can tell this difference (if the printing, part number, etc may be shared use between 4,1 / 5,1 tray).
 
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