Bought a CPU tray - fans at full speed

Discussion in 'Mac Pro' started by adam9c1, Mar 2, 2018.

  1. adam9c1, Mar 2, 2018
    Last edited: Mar 2, 2018

    adam9c1 macrumors 68000

    adam9c1

    Joined:
    May 2, 2012
    Location:
    Chicagoland
    #1
    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
     
  2. mattspace macrumors 65816

    mattspace

    Joined:
    Jun 5, 2013
    Location:
    Australia
    #2
    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.
     
  3. adam9c1 thread starter macrumors 68000

    adam9c1

    Joined:
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    #3
    The tray is a 2009

    it says
    Apple C 2009
    820-2482-A
     
  4. h9826790 macrumors G5

    h9826790

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    #4
    May be you purchased a 2009 tray, but the SMC version suggest that’s a genuine 5,1 tray.

    You may need to contact the seller to figure out what’s wrong.
     
  5. mattspace macrumors 65816

    mattspace

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    #5
    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.
     
  6. adam9c1 thread starter macrumors 68000

    adam9c1

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    #6
    Mattspace, you got me all lost.

    The eBay listing said the tray was from a 4,1 2009.
     
  7. adam9c1 thread starter macrumors 68000

    adam9c1

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    #7
    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).
     
  8. bsbeamer macrumors 68020

    Joined:
    Sep 19, 2012
    #8
    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.
     
  9. h9826790, Mar 3, 2018
    Last edited: Mar 3, 2018

    h9826790 macrumors G5

    h9826790

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    Location:
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    #9
    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?
     
  10. adam9c1 thread starter macrumors 68000

    adam9c1

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    #10
    Those numbers I wrote are from the tray. Next to the heatsink.
     
  11. adam9c1 thread starter macrumors 68000

    adam9c1

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    #11
    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!
     
  12. mattspace macrumors 65816

    mattspace

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    #12
    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.
     
  13. adam9c1 thread starter macrumors 68000

    adam9c1

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    #13
    So is there a way to physically ID 4,1 vs 5,1 single socket tray?
     
  14. Macschrauber macrumors 6502

    Macschrauber

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    Dec 27, 2015
    Location:
    Germany
    #14
    Try with macs fan control or alike to set up fan speeds
     
  15. adam9c1 thread starter macrumors 68000

    adam9c1

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    #15
    I’ve tried that app as well as TGPro.

    No dice.
     
  16. h9826790 macrumors G5

    h9826790

    Joined:
    Apr 3, 2014
    Location:
    Hong Kong
    #16
    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.
     
  17. bsbeamer macrumors 68020

    Joined:
    Sep 19, 2012
    #17
    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
     
  18. h9826790 macrumors G5

    h9826790

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    #18
    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.
     
  19. ActionableMango macrumors G3

    ActionableMango

    Joined:
    Sep 21, 2010
    #19
    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?
     
  20. adam9c1 thread starter macrumors 68000

    adam9c1

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    #20
    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.
     
  21. h9826790 macrumors G5

    h9826790

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    Hong Kong
    #21
    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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20 March 2, 2018